Question

Trigonometry Help

Prove the Identity:

cos^2 x + 1 = 2cos^2 x + sin^2 x

Any help is greatly appreciated with this one.

Answer 1

do u know
cos^2 x + sin^2 x =1

Answer 2

yeah i just saw that so on the right it beceomes =2(1) which =2? or is that wrong?

Answer 3

cos^2 x + 1
= cos^2 x + cos^2 x + sin^2 x
= 2cos^2 x + sin^2 x

Answer 4

well im totally wrong :\

Answer 5

Did you understand it NOW? :D

Answer 6

mattricked the lasts message you sent, was that working on the left or the right side?

Answer 7

ahh ok nevermind, i see it now. thanks guys

Answer 8

yw