Monday

October 20, 2014

October 20, 2014

Posted by **Yadira** on Monday, April 30, 2012 at 12:22am.

- Pre-Calc/Math -
**Steve**, Monday, April 30, 2012 at 11:46amcos2x = 2cos^2(x) - 1 = 2(4/9)-1 = 8/9-1 = -1/9

**Answer this Question**

**Related Questions**

pre-calc - Can someone help me find the exact value of 4csc(3pi/4)-cot(-pi/4)? ...

trig - Solve cos x-1 = sin^2 x Find all solutions on the interval [0,2pi) a. x=...

Trigonometry - a. Find the exact value of sin (theta - pi/6) b. Find the exact ...

Pre-Calculus-check answers - State the period and phase shift of the function y...

Math (Pre-calc) - I need to know how to solve this for my review questions. ...

Pre-Calc/Math - If cosx= -2/3 and pi/2, find the exact value of cos(pi/3-x)

Trig - check my answers plz! - 1. (P -15/17, -8/17) is found on the unit circle...

Pre Calc - Solve the equation on the interval [0,2pi). cos2x=(*2/2)

Pre Calc - Solve the equation on the interval [0,2pi). cos2x=(*2/2)

Calculus - Determine whether the curve has a tangent at the indicated point. f(x...