若3SinX=CosX,则Cos2X+Sin2X等于?为什么sin^2x+9sin^2x=1
sinx-2cosx=0.求sin2x-cos2x/1+sin^2x
已知:sinx-2cosx=0,求sin2x-cos2x/1+sin平方x
求证 sinx(cos^2 2x-sin^2 2x) + 2cosx cos2x sin2x= sin 5x
已知函数f(x)=[(2根号3sin^2x-sin2x)*cosx/sinx]+1
已知sin^2x+sin2x*sinx+cos2x=1,x属于(0,派/2),求tan2x
最简三角方程1.方程sin2x/cosx=cos2x/sinx解集?2.sin^2x+cos2x=1的解集?过程!xx!
若(cos2x)/[sin(x-π/4)]=(-根号2)/2,则cosx+sinx=?
若cos2x/sin(π/4-x)=-根号2/2,则sinx+cosx的值是
若cos2X/sin(X—45度)=根号2/2 则cosX+sinX?
已知向量m=(sin^2x+(1+cos2x)/2,sinx),n=(1/2cos2x-根号3/2sin2x,2sinx
f(x)=(sinx)^4+(cosx)^2+1/4*sin2x*cos2x,则f(x)
sinx=1/2+cosx,且x属于(0,π/2),则cos2x/sin(x-π/4)=