Friday

December 19, 2014

December 19, 2014

Posted by **Courtney** on Wednesday, May 12, 2010 at 12:12pm.

- trig -
**Reiny**, Wednesday, May 12, 2010 at 1:10pm4 cos^2x-1=0

cos^2 x = 1/4

cosx = ± 1/2

In I x = 60

in II , x = 180-60 = 120

in III, x = 180+60 = 240

in IV , x = 360-60 = 300

**Answer this Question**

**Related Questions**

advanced functions(trig) - solve for x, to the nearest degree, in the interval ...

trig - Find, to the nearest degree, the solution set of 3sin^2x = 5 cosx+1 over ...

HELPPPPPPP (TRIG) - find, to the nearest minute, the solution set of 1- sin x = ...

trig - find, to the nearest minute, the solution set of 1- sin x = 3 cos^2 x ...

trig - find, to the nearest minute, the solution set of 4 cos x + 5 = 6 sec x ...

trig - ind, to the nearest minute, the solution set of 4 cos x + 5 = 6 sec x ...

trig - To the nearest degree, all of the following angles are solutions of the ...

trig/math - If A is between 270degrees and 360degrees, and cos A=12/13, find the...

trig - find to the nearesr degree, all values of x between 0 degrees and 360 ...

trig - Give the measure of the acute angle with each given value to the nearest ...