Sunday
April 20, 2014

Homework Help: Math

Posted by Simon on Sunday, November 8, 2009 at 11:16pm.

Prove that cos2x=(1-tan^2x)/(1+tan^2x)

I can't find any identities that can help me with this. I'm really confused

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Trig Identities - Proving identities: 1) 1+ 1/tan^2x = 1/sin^2x 2) 2sin^2 x-1 = ...
Math - help really needed - Prove each idenity. 1+1/tan^2x=1/sin^2x 1/cosx-cosx=...
Math - help really needed - I'm sorry to double post; I don't want to seem ...
calculus - So I am suppose to evaulate this problem y=tan^4(2x) and I am ...
Trigonometry desperate help, clueless girl here - 2. solve cos 2x-3sin x cos 2x...
Math - How would you solve these questions using Trigonomic Identities? sin^2x...
Math - Trigonometry Identities problem: Prove the following; (tan^2x)(cos^2x...
Math - Prove each of the following identities. a)tan^2x = 1 cos^2x/cos^2x b)...
Math - Prove each identity: a) 1-cos^2x=tan^2xcos^2x b) cos^2x + 2sin^2x-1 = sin...
Precalculus - 1. What two common identities are most useful for simplifying ...

Search
Members