已知sin(π/2-x)=-2sin(π+x),x∈R,则sinx·cosx=

已知函数f(x)=(1+1 anx)sin^2x+m sin(x+π/4)sin(x-π/4) 已知-π/2＜x＜0,sin x+cos x=1/5求sin 2x+2 sin 已知sin(x+π/6)=1/3,求sin(5π/6-x)+sin^2(π/3-x) 已知sin(x+π/6)=1/4,求sin(5π/6-x)+sin^2(π/3-x) 已知函数f(x)=2根号3sin平方x-sin（2x-π/3) 2sin(x+π/4)sin(x-π/4)=? 已知函数F(X)=SIN(2X+φ)(-π 已知tanx=3,则[sin(π+x)-2sin(π/2+x)]/[sin(7π-x)+sin(7π/2-x)]已知tanx=3,则[sin(π+x)-2sin(π/2+x)]/[sin(7π-x)+sin(7π/2-x)]的值是 已知函数f(x)=2sin(ax-π/6)sin(ax+π/3) 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x 已知函数f（x）=［2sin（x-π/6）+√3sin x］cos x+sin^2x,x∈R 已知F(X)=根号3COS^2 X+SIN XCOS X-2SIN X*SIN(X-π/6),求F(X)的最大值 已知函数y=-sin^2x+sinx(-π/2 已知tanx=sin(x+π/2),则sinx= 已知tanx=sin(x+π/2),则sinx= 已知sin(x-π/6)=1/2,0 已知y=sin(2x+π/6) 求值域 已知sin(3π-α)=-2sin(π/2+α)则sinαcosα