Find the magnitude of angle A, if :
2 cos2 A - 3 cos A + 1 = 0
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2 sin A cos A - cos A - 2 sin A + 1 = 0
tan A - 2 cos A tan A + 2 cos A - 1 = 0
2 tan 3A cos 3A - tan 3A + 1 = 2 cos 3A
Solve for x :
2 cos 3x - 1 = 0