化简:cosxsin(y-x)+cos(y-x)sinx.
cos(x+y)sinx-sin(x+y)cosx
化简sin(x+y)sinx+cos(x+y)cosx等于?
化简sin(x+y)sinx+cos(x+y)cosx
化简cos(x+y)sinx-sin(x+y)cosx
求证:sin(x-y)/(sinx-siny)=cos[(x-y)/2]/cos[(x+y)/2]
求画出函数图象Z=cosx/cos(x-y)和Z=sinx/cos(x-y)
y=(1+sinx)/cosx,求导是不是等于(sinx+1)/(cos^2)x
sinx*sin(x+y)+cosx*cos(x+y)等于?
y=cosX-根号3sinX,怎么化简道y=2cos(X+π/3)
sin(x+y)-sinx=2cos(x+1/2y)sin(1/2y)的详细证明步骤.
Y=cos方x+sinx的最小值(|x|小于等于四分之π)
证明COS(X+Y)COS(X-Y)=COS^2X-SIN^2Y