Find the derivative of y with respect to s. y= sec 1(7s° + 4)

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
Question
### Topic: Calculus - Derivatives

**Objective:** Find the derivative of \( y \) with respect to \( s \).

**Problem Statement:**

Given the function:
\[ y = \sec^{-1}(7s^5 + 4) \]

Find \( \frac{dy}{ds} \).

---

**Solution:**

To find the derivative of \( y = \sec^{-1}(7s^5 + 4) \) with respect to \( s \), we apply the chain rule and the derivative formula for the inverse secant function.

The derivative is given by:
\[
\frac{dy}{ds} = \frac{35s^4}{\sqrt{(7s^5 + 4)^2 - 1} \cdot (7s^5 + 4)}
\]

**Explanation of the Derivative:**

1. **Numerator**: 
   \[ 35s^4 \]
   This is obtained by differentiating the inner function \( 7s^5 + 4 \), which results from applying the chain rule.

2. **Denominator**:
   - The term \(\sqrt{(7s^5 + 4)^2 - 1}\) represents the standard part of the derivative of the inverse secant function.
   - \((7s^5 + 4)\) is the original argument of the inverse secant function, which appears as a factor in the denominator.

**Note**: The derivative for inverse secant functions involves both the inner function and its derivative, adjusted for the arcsecant identity.
Transcribed Image Text:### Topic: Calculus - Derivatives **Objective:** Find the derivative of \( y \) with respect to \( s \). **Problem Statement:** Given the function: \[ y = \sec^{-1}(7s^5 + 4) \] Find \( \frac{dy}{ds} \). --- **Solution:** To find the derivative of \( y = \sec^{-1}(7s^5 + 4) \) with respect to \( s \), we apply the chain rule and the derivative formula for the inverse secant function. The derivative is given by: \[ \frac{dy}{ds} = \frac{35s^4}{\sqrt{(7s^5 + 4)^2 - 1} \cdot (7s^5 + 4)} \] **Explanation of the Derivative:** 1. **Numerator**: \[ 35s^4 \] This is obtained by differentiating the inner function \( 7s^5 + 4 \), which results from applying the chain rule. 2. **Denominator**: - The term \(\sqrt{(7s^5 + 4)^2 - 1}\) represents the standard part of the derivative of the inverse secant function. - \((7s^5 + 4)\) is the original argument of the inverse secant function, which appears as a factor in the denominator. **Note**: The derivative for inverse secant functions involves both the inner function and its derivative, adjusted for the arcsecant identity.
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