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cos(x)看到这个 cos(x)－cos(y)=?
化简sin(x)(cos(x)+cos(3x)+cos(5x)+cos(7x))
化简cos 2x
(cos(x))^-2导数
cos(x^2)dx
cos x>-1/2
/ (cos x + 1 ) dx
cos(x)²不定积分
cos根号x 求导,
cos x>0.区间
cos平方x
证明cos 2x cos x=1/2(cos x+cos 3x)
cos x/sin x+sin x/(1+cos x) 化简.
sin（sin（sin（sin（x）=cos（cos（cos（cos（x）,X等于多少?
∫x cos²x