Posted by **Joe** on Wednesday, July 13, 2011 at 4:03pm.

Given that SIN Theta = -1/sqrt(10) and theta is in quadrant 4, find sin2theta and cos2theta.

I'm not sure how to properly square the -1/sqrt10 and keep an exact answer other than decimal. Otherwise, my final answer is 1.632455533

## Answer This Question

## Related Questions

- trig - Given that SIN Theta = -1/sqrt(10) and theta is in quadrant 4, find ...
- easy trig - If sin(theta)=[sqrt(70)]/7 and theta is in Quadrant two, find the ...
- simple trig - If sin(theta)=[sqrt(70)]/7 and theta is in Quadrant two, find the ...
- math - theta is a first quadrant angle in standard position and cos theta = 1/(...
- Pre-Calculus-check answers - If cos theta = 0.8 and 270<theta<360, find ...
- Math - 1. Let (-7, 4) be a point on the terminal side of (theta). Find the exact...
- Precalculus check answers help! - 1.) Find an expression equivalent to sec theta...
- Precalculus check answers help! - 1.) Find an expression equivalent to sec theta...
- Calculus - Below are the 5 problems which I had trouble in. I can't seem to get ...
- math - tan theta= 15/8 and pi< theta<3pi/2 a. Sin(- theta) b. cos2theta c...

More Related Questions