   Chapter 10, Problem 38RE

Chapter
Section
Textbook Problem

# Find the length of the curve.38. x = 2 + 3t, y = cosh 3t, 0 ≤ t ≤ 1

To determine

To find: Find the length of the curve x=2+3t and y=cosh3t for 0t1 .

Explanation

Given:

The parametric equation for the variable x is as follows.

x=2+3t (1)

The parametric equation for the variable y is as follows.

y=cosh3t (2)

Calculation:

Differentiate equation (1) with respect to t .

dxdt=3 (3)

Differentiate equation (2) with respect to t .

dydt=3sinh3t (4)

Length is determined for the limits of 0 to 1 .

Calculate the length of the curve using the formula.

L=01(dxdt)2+(dydt)2dt (5)

Substitute the expressions from equation (3) and (4) into equation (5).

L=01(dxdt)2+(dydt)2

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