设 y=4 arctan x ,则y'(1)=?

设 y=4 arctan x ,则y'(1)=? 设y=arctan(x-y),则dy= 设y=arctan 1/x,则dy=rt 设z=arctan[（x+y）/（x-y）],则dz=? 设z=arctan(x+y),则σz/σy=? 设函数z=arctan(x/y),求全微分dz 设y=arctan根号x,求dy 设Y=arctan(5x) 求dy 设y=arctan x,求f'(0),f(0). 设ln(x^2+y^2)^(1/2)=arctan(y/x),则y的导数为 设y=1/a arctan x/a ,则 dy/dx arctan(y)=x+1, y=? arctan(x,arctan(x,y)是不是等于arctan(x/y)? 设F(X,Y)=arctan(x/y),求df|(1,1) 设y=y(x)是由方程ln(x^2+y^2)=arctan(y/x)+ln2-π/4确定的隐函数,求dy|(1,1) 设y=arctan(x+y),求他一阶二阶导数 设隐函数y=y(x)由方程式x=y+arctan y所确定,求dy 设方程x-y+arctan y=0确定了y=y(x),求dy/dx.