问个数学题啊，求导的。y=(3^x)arctanx,求dy
y=(3^x)arctanx,求dy
y=(3^x)arctanx dy=d3^x*arctanx+3^xdarctanx =(3^xln3*arctanx)dx+3^x*1/(1+x^2)dx =3^x*[ln3*arctanx+1/(1+x^2)]dx