Textbook Question
Find the derivatives of the functions in Exercises 1–42.
𝔂 = 3 .
(5x² + sin 2x)³/²
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3. Techniques of Differentiation
The Chain Rule
2:18 minutesProblem 3.15
Textbook Question
Find the derivatives of the functions in Exercises 1–42.
s = (sec t + tan t)⁵
Verified step by step guidance1
Identify the function: We have s = (sec t + tan t)⁵. This is a composite function where the outer function is u⁵ and the inner function is u = sec t + tan t.
Apply the chain rule: The chain rule states that if you have a composite function f(g(x)), the derivative is f'(g(x)) * g'(x). Here, f(u) = u⁵ and g(t) = sec t + tan t.
Differentiate the outer function: The derivative of u⁵ with respect to u is 5u⁴. So, f'(u) = 5(sec t + tan t)⁴.
Differentiate the inner function: The derivative of sec t is sec t tan t, and the derivative of tan t is sec² t. Therefore, g'(t) = sec t tan t + sec² t.
Combine the derivatives using the chain rule: Multiply the derivative of the outer function by the derivative of the inner function: s'(t) = 5(sec t + tan t)⁴ * (sec t tan t + sec² t).
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Video duration:
2mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Derivative
The derivative of a function measures how the function's output value changes as its input value changes. It is a fundamental concept in calculus that provides the slope of the tangent line to the curve at any given point. The derivative can be computed using various rules, such as the power rule, product rule, and chain rule, depending on the form of the function.
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Derivatives
Chain Rule
The chain rule is a formula for computing the derivative of the composition of two or more functions. It states that if you have a function that is composed of another function, the derivative can be found by multiplying the derivative of the outer function by the derivative of the inner function. This is particularly useful when dealing with functions raised to a power, as seen in the given problem.
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Trigonometric Functions
Trigonometric functions, such as secant (sec) and tangent (tan), are fundamental functions in calculus that relate angles to ratios of sides in right triangles. Their derivatives are essential for solving problems involving rates of change in contexts like physics and engineering. Understanding the derivatives of these functions is crucial for applying the chain rule effectively in the given exercise.
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