Решите подробнее
1) cos^{2} ( \pi -x)+sin 2 x =0
2)2x^{2} cos x +9 - 18 cos x-x^{2} = 0
3) cos 4x+2 sin 4x=1
1) cos^{2} ( \pi -x)+sin 2 x =0
2)2x^{2} cos x +9 - 18 cos x-x^{2} = 0
3) cos 4x+2 sin 4x=1
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