1. ## Trig Identities

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

Prove they equal each other

2. I think you missed typed your question.

You mean this $\frac{(1+(1-tan^2(x))}{(1+(tan^2(x))} = cos^2(x)$
right?

As per your question, use this formula $1 + tan^2x = sec^2x$and this formula $cos^2x = 1- sin^2x$

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

4. 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.