cos(-x)化简是-COS(X) SIN(-X)是SIN(X)
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cos(-x)化简是-COS(X)SIN(-X)是SIN(X)cos(-x)化简是-COS(X)SIN(-X)是SIN(X)cos(-x)化简是-COS(X)SIN(-X)是SIN(X)cos(-x)
cos(-x)化简是-COS(X) SIN(-X)是SIN(X)
cos(-x)化简是-COS(X) SIN(-X)是SIN(X)
cos(-x)化简是-COS(X) SIN(-X)是SIN(X)
cos(-x)化简是-COS(X)错!
应为:cos(-x)=cosx
SIN(-X)是SIN(X)错!
应为:sin(-x)=-sinx
这个可以结合“一全正二正弦三正切四余弦”的口诀,将“-x”看做第四象限角来判断
cos x
cos x
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
cos(-x)化简是-COS(X) SIN(-X)是SIN(X)
cos(π/3+x)+cos(π/3-x)
2(cos x)^2=1+cos 2x,
cos^2(x)求导
将cos^2(x+75)+cos^2(x+15)+cos(x+15)cos(x+75)化为标准三角函数
证明COS(X+Y)COS(X-Y)=COS^2X-SIN^2Y
cos^2x+cos^2(x+120°)+cos^2(x+240°)
cos(x)看到这个 cos(x)-cos(y)=?
sin(-x) cos(-x)等于多少
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f(x)=sin x +cos x +sin x * cos x ,求值域
化简cos 2x
(cos(x))^-2导数
cos(x^2)dx
cos x>-1/2