cosx + cos2x + cos 3x + cos4x = 0 x =
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cosx+cos2x+cos3x+cos4x=0x=cosx+cos2x+cos3x+cos4x=0x=cosx+cos2x+cos3x+cos4x=0x=请点击图片查看解法
cosx + cos2x + cos 3x + cos4x = 0 x =
cosx + cos2x + cos 3x + cos4x = 0 x =
cosx + cos2x + cos 3x + cos4x = 0 x =
请点击图片查看解法
