"表示度.sin(65"-x)cos(x-20")+cos(65"-x)cos(110"-x)
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
sin(-x) cos(-x)等于多少
证明COS(X+Y)COS(X-Y)=COS^2X-SIN^2Y
化简:1+sin(x-360度)cos(x-270度)-2cos平方x
若f(cos x)=cos 2x,则f(sin 15度)的值?
化简(1)√3sin x+cos x (2)√2(sin x-cos x) (3)√2cos x-√6sin x
已知f(cos x)=cos 3x 求f(sin x)的值
已知A(cos x,sin x)B(cos y,sin y)(cos z,sinz)O为原点.
cos(x+y)sinx-sin(x+y)cosx
cos(x+y)=?sin(x+y)=?
sinx/(sin^3x+cos^3x)dx不定积分
∫(cos2x/cos方x*sin方x)dx