cos(97x)=x
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cos(97x)=x
cos x /sin x=
cos(x)看到这个 cos(x)-cos(y)=?
证明cos 2x cos x=1/2(cos x+cos 3x)
y=2cos x (sin x+cos x)
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
cos x
cos x
2(cos x)^2=1+cos 2x,
sin^2 x-cos^2 x=cos
cos(x-2派/3)=-cos(x+派/3)
y=(cos x-2)/(cos x-1)的值域
已知sin(x)+3cos(x)=2,求sin(x)-cos(x)/sin(x)+cos(x)=?
为什么COS(-X)=COSX?
Cos x=-1/2
为什么cos(-x)=cosx.
cos(0.25π-x)=
:x = r cos A