作业帮cos(x-兀)= cos(x–兀)= sin(二分之五兀+cos(x-兀)=cos(x–兀)=sin(二分之五兀+x)=
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cos(x-兀)= cos(x–兀)= sin(二分之五兀+cos(x-兀)=cos(x–兀)=sin(二分之五兀+x)=
cos(x-兀)= cos(x–兀)= sin(二分之五兀+
cos(x-兀)=
cos(x–兀)=
sin(二分之五兀+x)=
cos(x-兀)= cos(x–兀)= sin(二分之五兀+cos(x-兀)=cos(x–兀)=sin(二分之五兀+x)=
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cos(x-兀)=cosxcos∏-sinxsin∏=-cosx(cos∏=-1;sin∏=0)
f(x)=cos(2兀-x)cos(2/兀-x)-sin方x化简速求
cos(x)看到这个 cos(x)－cos(y)=?
证明cos 2x cos x=1/2(cos x+cos 3x)
cos(x-兀)= cos(x–兀)= sin(二分之五兀+cos(x-兀)=cos(x–兀)=sin(二分之五兀+x)=
sin（sin（sin（sin（x）=cos（cos（cos（cos（x）,X等于多少?
cos(97x)=x
cos x /sin x=
y=2cos x (sin x+cos x)
已知cos(x+兀/6)=1/4,求cos(5兀/6-x)+cos2(兀/3-x)的值
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
函数f(x)=cos(2兀-x)+cos（((8k+1)/2)π-x）,k
函数f(x)=cos(2兀-x)+cos（((8k+1)/2)π-x）,k
为什么COS(-X)=COSX?
Cos x=-1/2
为什么cos（-x)=cosx.