5 Logarithmic, Exponential, and Other Transcendental Functions

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5 Logarithmic, Exponential, and Other Transcendental Functions Copyright © Cengage Learning. All rights reserved.

5.6 Inverse Trigonometric Functions: Differentiation Copyright © Cengage Learning. All rights reserved.

Objectives Develop properties of the six inverse trigonometric functions. Differentiate an inverse trigonometric function. Review the basic differentiation rules for elementary functions.

Inverse Trigonometric Functions

Inverse Trigonometric Functions None of the six basic trigonometric functions has an inverse function. This statement is true because all six trigonometric functions are periodic and therefore are not one-to-one. In this section you will examine these six functions to see whether their domains can be redefined in such a way that they will have inverse functions on the restricted domains.

Inverse Trigonometric Functions Under suitable restrictions, each of the six trigonometric functions is one-to-one and so has an inverse function, as shown in the following definition.

Inverse Trigonometric Functions The graphs of the six inverse trigonometric functions are shown in Figure 5.29. Figure 5.29

Example 1 – Evaluating Inverse Trigonometric Functions Evaluate each function. Solution:

Example 1 – Evaluating Inverse Trigonometric Functions cont’d

Inverse Trigonometric Functions Inverse functions have the properties f (f –1(x)) = x and f –1(f (x)) = x. When applying these properties to inverse trigonometric functions, remember that the trigonometric functions have inverse functions only in restricted domains. For x-values outside these domains, these two properties do not hold. For example, arcsin(sin π) is equal to 0, not π.

Inverse Trigonometric Functions

Example 2 – Solving an Equation

Derivatives of Inverse Trigonometric Functions

Derivatives of Inverse Trigonometric Functions The derivative of the transcendental function f (x) = ln x is the algebraic function f'(x) = 1/x. You will now see that the derivatives of the inverse trigonometric functions also are algebraic.

Derivatives of Inverse Trigonometric Functions The following theorem lists the derivatives of the six inverse trigonometric functions.

Example 4 – Differentiating Inverse Trigonometric Functions The absolute value sign is not necessary because e2x > 0.

Review of Basic Differentiation Rules

Review of Basic Differentiation Rules An elementary function is a function from the following list or one that can be formed as the sum, product, quotient, or composition of functions in the list.

Review of Basic Differentiation Rules With the differentiation rules introduced so far in the text, you can differentiate any elementary function. For convenience, these differentiation rules are summarized below.

Review of Basic Differentiation Rules cont’d