zuai-logo

Differentiation of Composite & Inverse Functions

Emily Davis

Emily Davis

6 min read

Listen to this study note

Study Guide Overview

This study guide covers the derivatives of inverse trigonometric functions. It explains the inverse function theorem and how it's used to find the derivatives of arcsin(x), arccos(x), and arctan(x). It summarizes the derivatives of all six inverse trig functions and provides a worked example and practice problems. Key terms like the chain rule and trigonometric identities are also explained.

Derivatives of Inverse Trigonometric Functions

Table of Contents

  1. Introduction
  2. Inverse Function Theorem
  3. Differentiating Inverse Sine
  4. Differentiating Inverse Cosine
  5. Differentiating Inverse Tangent
  6. Summary of Derivatives
  7. Worked Example
  8. Practice Questions
  9. Glossary
  10. Key Takeaways

Introduction

In this section, we will explore the differentiation of inverse trigonometric functions. These functions are crucial in calculus and can be differentiated using various methods, including the inverse function theorem, the chain rule, and trigonometric identities.

Inverse Function Theorem

The inverse function theorem is essential for differentiating inverse trigonometric functions. It can be written as:

dydx=1(dxdy)\frac{dy}{dx} = \frac{1}{\left(\frac{dx}{dy}\right)}

or

g(x)=1f(g(x)){g}^{\prime}(x) = \frac{1}{{f}^{\prime}(g(x))}

where g(x)=f1(x)g(x) = {f}^{-1}(x).

Key Concept

Inverse trigonometric functions are sometimes referred to using "arc" notation, e.g., arcsin,x\mathrm{arcsin} , x is the same as sin1x\sin^{-1} x.

Differentiating Inverse Sine

To differentiate sin1x\sin^{-1} x, we use the inverse function theorem:

  1. Let g(x)=sin1xg(x) = \sin^{-1} x and $ f(x) = \sin ...

Question 1 of 11

What is the derivative of sin1(x)\sin^{-1}(x)? 🤔

11x2\frac{1}{\sqrt{1 - x^2}}

11x2-\frac{1}{\sqrt{1 - x^2}}

11+x2\frac{1}{1 + x^2}

11+x2-\frac{1}{1 + x^2}