Thread: Trig Identities

(1+(1-tan^2(x))/(1+(tan^2(x))=cos^2(x)

Prove they equal each other

I think you missed typed your question.

You mean this
right?

As per your question, use this formula and this formula

Nope, I didn't type it wrong, it is the original equation

As Truthbetold noticed already (it was apparent before he edited his post), the question is wrong. The expressions you have entered do not equal each other.