Решить уравнения:
а) 4 cos^2 x - 3 = 0
б) 4 sin^2 x - 1 = 0
в) 3 sin^2 x + sin x cos x = 2 cos^2 x
г) 2 cos^2 x - 3 sin x cos x + sin^2 x = 0 
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