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а) 3 sin^2 x - cos^2 x =0
б) 3 sin^2 x + 4 cos^2 x - 13 sin x * cos x=0
в) sin^2 x - 2 sin x * cos x= 3 cos^2 x
г) 3 cos^2 x = 4 sin x * cos x - sin^2 x
а) 3 sin^2 x - cos^2 x =0
б) 3 sin^2 x + 4 cos^2 x - 13 sin x * cos x=0
в) sin^2 x - 2 sin x * cos x= 3 cos^2 x
г) 3 cos^2 x = 4 sin x * cos x - sin^2 x
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