Posted by **Gina** on Wednesday, November 11, 2009 at 3:32pm.

If sin^2X=A what is an algebraic expression in A for cos(2X). I have no idea where to even begin with this!

## Answer this Question

## Related Questions

- TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...
- trig - The expression 4 sin x cos x is equivalent to which of the following? (...
- trig 26 - simplify to a constant or trig func. 1. sec Ču-tan Ču/cos Čv+sin Čv ...
- pre calc trig check my work please - sin x + cos x -------------- = ? sin x sin ...
- trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...
- algebra - Can someone please help me do this problem? That would be great! ...
- trig 30 - For csc^2 A-1/cot A csc A, what is the simplest equivalent trig ...
- calculus/Trig - Suppose you wish to express sin(3t) in terms of sint and cost. ...
- trigonometry HELP pleasE! - these must be written as a single trig expression, ...
- Trig - Given: cos u = 3/5; 0 < u < pi/2 cos v = 5/13; 3pi/2 < v < ...

More Related Questions