Saturday

October 25, 2014

October 25, 2014

Posted by **Maria** on Monday, March 19, 2012 at 7:38pm.

cos4x-cos2x=0

So,this is what i've done so far:

cos4x-cos2x=0

cos2(2x)-cos2x

(2cos^2(2x)-1)-(2cos^2(x)-1)

No idea what to do next.

- Pre-Calculus -
**bobpursley**, Monday, March 19, 2012 at 8:10pmhttp://answers.yahoo.com/question/index?qid=20080413170208AAL5ESb

**Answer this Question**

**Related Questions**

Precalculus - Please help!!!!!!!!!!! Find all solutions to the equation in the ...

Math - Trig - Double Angles - Prove: cos4x = 8cos^4x - 8cos^2x + 1 My Attempt: ...

trig - I keep trying to find the power reducing formula for sin^4(x), but I can'...

math - the problem is 2cos^2x + sinx-1=0 the directions are to "use an identity ...

calculus - Find all solutions to the equation in the interval [0,2pi) Cosx-cos2x

advanced functions - Use the Pythagorean identity to show that the double angle ...

Trigonometry - Need help solving problems using the Trigonometric Identities: ...

trig - Find the solutions to the equation cos2x=sinx and 2cos^2x-3cosx-3=0

Calculus - In the interval (0 is less than or equal to x which is less than or ...

calculus - solution for limit as delta x approaches 0 (1-cos4x/1-cos2x)