Posted by kc on Sunday, July 24, 2011 at 8:54pm.
solve the equation 4cos^2x1=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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