Prove the Identity: 2cos^2x-1=(1-tan^2x)/(1 tan^2x)

At Ask Me Help Desk you can ask questions in any topic and have them answered for free by our experts. To ask questions or participate in answering them you must register for a free account. By registering you will be able to:

Get free answers from experts in any of our 300+ topics.
Accept money for answers that you provide.
Communicate privately with other members (PM).
See fewer ads.

michtheunicorn

Mar 29, 2012, 06:23 PM

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

ebaines

Mar 30, 2012, 05:10 AM

Convert tanx to sinx/cosx, and remember that sin^2x = 1 - cos^2x. It works out nicely.