Question

Can someone please help me verify this trig identity! cos^2-sin^2=1-2sin^2

Answer 1

Do you know how to do this problem?

Answer 2

for alegbra?

Answer 3

I am doing preacalc

Answer 4

cos^2 =1- sin^2
therefore cos^2 -sin^2 = 1 -sin^2-sin^2 =1- 2sin^2
that's it

Answer 5

How did you do that? When verifying trig identities you have to only simplify one side of the equal sign.

Answer 6

Oh. Nevermind! I get what your saying!! Thanks! :)