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Last updated on July 18th, 2025

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Derivative of 6sinx

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We use the derivative of 6sin(x), which is 6cos(x), to understand how the sine function changes in response to a slight change in x. Derivatives help us calculate profit or loss in real-life situations. We will now talk about the derivative of 6sin(x) in detail.

Derivative of 6sinx for UK Students
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What is the Derivative of 6sinx?

We now understand the derivative of 6sinx. It is commonly represented as d/dx (6sinx) or (6sinx)', and its value is 6cos(x). The function 6sinx has a clearly defined derivative, indicating it is differentiable within its domain. The key concepts are mentioned below: Sine Function: sin(x) is a fundamental trigonometric function. Constant Multiple Rule: Rule for differentiating a constant times a function. Cosine Function: cos(x) is the derivative of sin(x).

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Derivative of 6sinx Formula

The derivative of 6sinx can be denoted as d/dx (6sinx) or (6sinx)'. The formula we use to differentiate 6sinx is: d/dx (6sinx) = 6cos(x) The formula applies to all x.

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Proofs of the Derivative of 6sinx

We can derive the derivative of 6sinx using proofs. To show this, we will use the trigonometric identities along with the rules of differentiation. There are several methods we use to prove this, such as: By First Principle Using Constant Multiple Rule We will now demonstrate that the differentiation of 6sinx results in 6cos(x) using the above-mentioned methods: By First Principle The derivative of 6sinx can be proved using the First Principle, which expresses the derivative as the limit of the difference quotient. To find the derivative of 6sinx using the first principle, we will consider f(x) = 6sinx. Its derivative can be expressed as the following limit. f'(x) = limₕ→₀ [f(x + h) - f(x)] / h Given that f(x) = 6sinx, we write f(x + h) = 6sin(x + h). Substituting these into the equation, f'(x) = limₕ→₀ [6sin(x + h) - 6sinx] / h = 6 limₕ→₀ [sin(x + h) - sinx] / h = 6 limₕ→₀ [2cos((x + x + h)/2)sin(h/2)] / h = 6cos(x) limₕ→₀ [sin(h/2)] / (h/2) = 6cos(x) Thus, we have proved it. Using Constant Multiple Rule To prove the differentiation of 6sinx using the constant multiple rule, We use the formula: d/dx [c f(x)] = c f'(x) Let c = 6 and f(x) = sinx, d/dx (6sinx) = 6 d/dx (sinx) = 6cos(x) Hence, proved.

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Higher-Order Derivatives of 6sinx

When a function is differentiated several times, the derivatives obtained are referred to as higher-order derivatives. Higher-order derivatives can help us understand the behavior of functions like 6sin(x). For the first derivative of a function, we write f′(x), which indicates how the function changes or its slope at a certain point. The second derivative is derived from the first derivative, which is denoted using f′′(x). Similarly, the third derivative, f′′′(x), is the result of the second derivative, and this pattern continues. For the nth derivative of 6sin(x), we generally use f⁽ⁿ⁾(x) to signify the nth derivative of a function f(x), which tells us the change in the rate of change.

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Special Cases:

When x is π/2, the derivative is 6cos(π/2), which is 0, as the cosine of π/2 is zero. When x is 0, the derivative of 6sinx = 6cos(0), which is 6, as the cosine of 0 is one.

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Common Mistakes and How to Avoid Them in Derivatives of 6sinx

Students frequently make mistakes when differentiating 6sinx. These mistakes can be resolved by understanding the proper solutions. Here are a few common mistakes and ways to solve them:

Mistake 1

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Not simplifying the equation

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Students may forget to apply the constant multiple rule, which can lead to incorrect results. They often skip steps and directly arrive at the result, especially when solving using the product or chain rule. Ensure that each step is written in order. Students might think it is awkward, but it is important to avoid errors in the process.

Mistake 2

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Forgetting the Trigonometric Identities

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They might not remember that the derivative of sinx is cosx. Keep in mind that understanding trigonometric identities is crucial for differentiating trigonometric functions correctly.

Mistake 3

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Incorrect use of Constant Multiple Rule

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While differentiating functions such as 6sinx, students misapply the constant multiple rule. For example: Incorrect differentiation: d/dx (6sinx) = sinx. d/dx (c f(x)) = c f'(x) (where c = 6 and f(x) = sinx) To avoid this mistake, write the constant multiple rule without errors. Always check for errors in the calculation and ensure it is properly simplified.

Mistake 4

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Not Writing Constants and Coefficients

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There is a common mistake that students at times forget to multiply the constants placed before sinx. For example, they incorrectly write d/dx (6sinx) = cosx. Students should check the constants in the terms and ensure they are multiplied properly. For e.g., the correct equation is d/dx (6sinx) = 6cosx.

Mistake 5

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Not Applying the Chain Rule

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Students often forget to use the chain rule. This happens when the derivative of the inner function is not considered. For example: Incorrect: d/dx (6sin(2x)) = 6cos(2x). To fix this error, students should divide the functions into inner and outer parts. Then, make sure that each function is differentiated. For example, d/dx (6sin(2x)) = 12cos(2x).

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Examples Using the Derivative of 6sinx

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Problem 1

Calculate the derivative of (6sinx·cosx)

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Here, we have f(x) = 6sinx·cosx. Using the product rule, f'(x) = u′v + uv′ In the given equation, u = 6sinx and v = cosx. Let’s differentiate each term, u′ = d/dx (6sinx) = 6cosx v′ = d/dx (cosx) = -sinx substituting into the given equation, f'(x) = (6cosx)·(cosx) + (6sinx)·(-sinx) Let’s simplify terms to get the final answer, f'(x) = 6cos²x - 6sin²x Thus, the derivative of the specified function is 6cos²x - 6sin²x.

Explanation

We find the derivative of the given function by dividing the function into two parts. The first step is finding its derivative and then combining them using the product rule to get the final result.

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Problem 2

A water wheel is rotating, and its height above the ground is modeled by the function y = 6sin(x), where y represents the height at an angle x. If x = π/6 radians, find the rate of change of the height.

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We have y = 6sin(x) (height of the water wheel)...(1) Now, we will differentiate the equation (1) Take the derivative of 6sin(x): dy/dx = 6cos(x) Given x = π/6, substitute this into the derivative, dy/dx = 6cos(π/6) dy/dx = 6(√3/2) = 3√3 Hence, the rate of change of the height at x = π/6 is 3√3.

Explanation

We find the rate of change of the height of the water wheel at x = π/6 as 3√3, which represents the speed at which the height is changing at that particular angle.

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Problem 3

Derive the second derivative of the function y = 6sin(x).

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The first step is to find the first derivative, dy/dx = 6cos(x)...(1) Now we will differentiate equation (1) to get the second derivative: d²y/dx² = d/dx [6cos(x)] = 6(-sin(x)) = -6sin(x) Therefore, the second derivative of the function y = 6sin(x) is -6sin(x).

Explanation

We use the step-by-step process, where we start with the first derivative. We then differentiate cos(x) to find the second derivative and obtain the final answer.

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Problem 4

Prove: d/dx ((6sinx)²) = 12sin(x)cos(x).

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Let’s start using the chain rule: Consider y = (6sin(x))² = 36sin²(x) To differentiate, we use the chain rule: dy/dx = 2(36sin(x)) d/dx [sin(x)] = 72sin(x) cos(x) Substituting y = (6sin(x))², d/dx ((6sinx)²) = 12sin(x)cos(x) Hence proved.

Explanation

In this step-by-step process, we used the chain rule to differentiate the equation. Then, we replace sin(x) with its derivative. As a final step, we substitute y = (6sin(x))² to derive the equation.

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Problem 5

Solve: d/dx (6sinx/x)

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To differentiate the function, we use the quotient rule: d/dx (6sinx/x) = (d/dx (6sinx)·x - 6sinx·d/dx(x)) / x² We will substitute d/dx (6sinx) = 6cosx and d/dx (x) = 1 = (6cosx·x - 6sinx) / x² = (6xcosx - 6sinx) / x² Therefore, d/dx (6sinx/x) = (6xcosx - 6sinx) / x²

Explanation

In this process, we differentiate the given function using the quotient rule. As a final step, we simplify the equation to obtain the final result.

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FAQs on the Derivative of 6sinx

1.Find the derivative of 6sinx.

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2.Can we use the derivative of 6sinx in real life?

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3.Is it possible to take the derivative of 6sinx at the point where x = π/2?

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4.What rule is used to differentiate 6sinx/x?

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5.Are the derivatives of 6sinx and sinx the same?

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Important Glossaries for the Derivative of 6sinx

Derivative: The derivative of a function indicates how the given function changes in response to a slight change in x. Sine Function: The sine function is one of the primary six trigonometric functions and is written as sin(x). Cosine Function: A trigonometric function that is the derivative of the sine function. It is typically represented as cos(x). Constant Multiple Rule: A rule used in differentiation where the derivative of a constant times a function is the constant times the derivative of the function. Quotient Rule: A rule used in differentiation to find the derivative of a quotient of two functions.

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Jaskaran Singh Saluja

About the Author

Jaskaran Singh Saluja is a math wizard with nearly three years of experience as a math teacher. His expertise is in algebra, so he can make algebra classes interesting by turning tricky equations into simple puzzles.

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Fun Fact

: He loves to play the quiz with kids through algebra to make kids love it.

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