sin 2x+cos 2x=根号2sin (2x+π/4)怎么得出来的,
化简2sin^2[(π/4)+x]+根号3(sin^x-cos^x)-1
sin(5x)-sin(3x)= 根号2cos(4x)
已知函数f(x)=sin^2*x-根号3*sinπ/4*x*cosπ/4*x
求化简f(x)=sin^2x+2根号3sin(x+π/4)cos(x-π/4)-cos^2x-根号3
f(x)=sin平方x+2根号3sin(x+π/4)cos(x-π/4)-cos平方x-根号3
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
cosX+sinX=根号2sin(X+π/4)是怎么推出来的,
证明sin x+cos x的最大值等于 根号2
三角函数2sin(x/2+π/4)cos(x/2+π/4)=sin(x+π/4)=cosx是怎么来的
2sin(2πx)cos(2πx)+根号(3)sin(2πx)=0 0
已知函数f(x)=cos^4(x)+(2根号3)sinxcosx-sin^4(x)
化简 1/2cos x-根号3/2sin x 根3sin x+cos x