Asked by Luis

(cosx - sinx)^2 + (cosx + sinx)^2 = 2

Iam in this step:

2cos^2(x) + 2sin^2(x) = 2

How can I make the equation on the right equal 2
Answered by Steve
oh, please. What is the first and most fundamental trig identity you ever learned?

cos^2 + sin^2 = 1

right? Time for the duhh! and head slap.
Answered by Luis
Thank You
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