February 19, 2017

Homework Help: Math

Posted by Ann on Friday, May 10, 2013 at 11:50am.

What is the exact answer to cos^2x - sin^2x = 0 for between 0 and 2pi?

I got x = pi/4 and x = 5pi/4. But the answer key says there are two additional answers which are 3pi/4 and 7pi/4. I don't know how to get these. Any help is much appreciated!

Answer This Question

First Name:
School Subject:

Related Questions

More Related Questions