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How do you solve $cos^2x = 3/4$ ?

1 Answer

Nov 2, 2015

Solve $cos^2 x = 3/4$

Ans: $+- pi/6$ and $+- (5pi)/6$

Explanation:

$cos^2 x = 3/4$ --> $cos x = +- sqrt3/2$

$a. cos x = sqrt3/2$ --> arc $x = +- pi/6$
$b. cos x = - sqrt3/2$ --> arc $x = +- (5pi)/6$

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