Tuesday
September 23, 2014

Homework Help: trig

Posted by Joe on Wednesday, July 13, 2011 at 4:10pm.

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 Sin2Theta = -.7255970691 and cos2theta = 1.632455533

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Pre-Calculus - Given that SIN Theta = -1/sqrt(10) and theta is in quadrant 4, ...
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/(...
Trig - Find the exact value of sin2(theta) if cos(theta) = -sqrt 5/3 and 180 <...
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...
Trig - Let (theta) be an angle in quadrant II such that sec(theta) -4/3 . Find ...
Trig(3 all with work) - 1)Find the exact value of cos 105 by using a half-angle ...

Search
Members