1 . 3 cos 2x -5 cos x=1
2. cos 3x-cos 5x=sin 4x
3. 2 sin x - cos x =0
4. 3 sin ^2x + sin x cos x - 4 cos ^2x=0
2. cos 3x-cos 5x=sin 4x
3. 2 sin x - cos x =0
4. 3 sin ^2x + sin x cos x - 4 cos ^2x=0
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2 ответ = 4
3 ответ = 0
4 ответ = 0