## Trending News

Promoted

# Proving Trig Identities?

Prove:

Question 1:

1 - sin2x / cos2x = 1 - tanx / 1 + tanx

Question 2:

1 + sin2x / cosx + sinx = cos2x / cosx - sinx

Update:

Ignore question 2, I figured it out.

### 1 Answer

Relevance

- ted sLv 71 decade agoFavorite Answer
the right side is nothing more than [cos x - sin x] / [ cos x + sin x], multiply top & bottom by [ cos x - sin x] and recognize the forms of cos 2x and sin 2x

Still have questions? Get your answers by asking now.