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sweet_love8


Giải phương trình:
1) $cot x -1 = \dfrac{cos2x}{1+tanx}+sin^2 x -\dfrac{1}{2}sin2x$
2) $sinx +sin2x +sin3x= cosx +cos2x +cos3x$
3) $2sin4x +16 sin^3 x.cosx +3cos2x =5$
4) $4sin^3 x = sinx +cosx$
1) $cot x -1 = \dfrac{cos2x}{1+tanx}+sin^2 x -\dfrac{1}{2}sin2x$
2) $sinx +sin2x +sin3x= cosx +cos2x +cos3x$
3) $2sin4x +16 sin^3 x.cosx +3cos2x =5$
4) $4sin^3 x = sinx +cosx$
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