sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
sin(-x) cos(-x)等于多少
sin x(sin x+cos x)=1求x等于多少
证明COS(X+Y)COS(X-Y)=COS^2X-SIN^2Y
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
sin(-x)=sin(x),cos(-x)=-cosx对吗?
sin^3x-cos^3x化简等于多少
sin^2(x)cos^2(x)积分等于多少
cos^2x-sin^2x等于多少?
(sin@-cos@除以sin@+cos@)+(sin@+cos@除以sin@—cos@)化简出来等于多少
cos(arc sin x/a)等于什么
sin,cos,tan(x-派)分别等于什么