Question

cos^2(x) +1 =cos^2(x) + sin^2(x) identity

Answer 1

that is not an identity because left hand side = 1

Answer 2

@cwrw238 sorry it's cos^2(x) +1 =2cos^2(x) + sin^2(x)

Answer 3

ahh thats more like it

Answer 4

lets take the right side and replace sin^2 x by 1 - cos^2 x

( we get this from the identity sin"x + cos^2 x = 1)

the right side becomes
2cos^2 x + 1 - cos^2 x


do you see how to continue?

Answer 5

@cwrw238 yes thank you

Answer 6

yw