Tuesday
September 30, 2014

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!

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