y=sinx,y=sin(t+x)是偶函数,求t

y=sinx,y=sin(t+x)是偶函数,求t 函数f（x)=sin(3x+y)是偶函数,求y的值 设y=sinx²+sin²x,求y' 设函数y=y(x)由参数方程x=cos t,y=sin t - t cos t确定,求dy/dx 证明sin(x+y)sin(x-y)=sinx-siny 如何x(t)=cos(t)+asin(t) y(t)=sin(t)+bcos(t) expressing x(t) in 求T的值:y=(cosx-sinx)^2; y=sin(2x+4分之π)cos(2x+4分之π)； y=3sin(2分之 Y=sin(2X+a)是偶函数,求a的值 设x=e'sin t,y=e'cos t,求dy/dx. 求导：x=cos^4*t,y=sin^4*t,求dy/dx 求下列导数：sin(x+y)=sinx+siny e^x+x=e^y+y 求函数z=sinx+siny+sin(x+y)(0