Posted by **kc** on Sunday, July 24, 2011 at 8:54pm.

solve the equation 4cos^2x-1=0

- pre cal 2 -
**Henry**, Monday, July 25, 2011 at 8:40pm
4c0s^2x - 1 = 0.

4cos^2x = 1,

Divide both sids by 4:

cos^2x = 0.25,

Take sqrt of both sides:

cosx = 0.5,

X = 60 deg.

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