Posted by **Gregor** on Sunday, October 23, 2011 at 6:42pm.

How do i solve for this identity.....

cos2theta=2-sec^2theta/sec^2theta

## Answer this Question

## Related Questions

- Calculus - What is the integral of 1-tan^2theta from 0 to pi/3? Using the ...
- Math - Prove: [(tan^2theta+1)(cos^2theta-1)]=1-sec^2theta
- trig - Write each identity expression in terms of:1. cos theta= a. sin^2theta...
- Math - 1)Find cos theta if sin theta=3/5 and 90 degrees<theta<180 degrees...
- Pre-Calculus - Verify: 1/(1-sintheta) * 1/(1+sintheta) = sec^2theta sec^2theta ...
- trig - establish identity 5csc^2theta-3cot^2theta=2csc^2theta+3
- math - There are no typos and no work b/c I don't know how to do them. Thanks. 1...
- Math - There are no typos and no work b/c I don't know how to do them. Thanks. 1...
- Math - sin theta = 8/17 and theta is in the second quadrant. Find sin(2theta),...
- trigonometry - how to solve cot theta+tan theta=csc^2theta+sec^2theta