- #1

chewy

- 15

- 0

## Homework Statement

definate integral to find length of line

x = int [sqrt( (sec t)^4 - 1)

integrate from 0 to y with -pi/4 < y > pi/4

it is actually y is equal or more/less than pi/4

## The Attempt at a Solution

Ive worked out that the length of the line will be the same from -pi/4 to 0 as 0 to pi/4,

giving me

x = 2*int(sqrt( (sec t)^4 - 1)

integrating from 0 to pi/4,

im struggling with the integral, i know it must be substitution and i ve tried numerous trig identities just been coming up blank so far. a little push in the right direction would be great