解
y=e^√x²+1
y‘=(e^√x²+1)'
=e^√x²+1(√x²+1)'(x²+1)
=e^√x²+1[1/2(x²+1)^(-1/2)]×2x
=(xe^√x²+1)/(√x²+1)y=cosln(1+3x)求导这个呢 谢谢y'=cosln(1+3x)'=-sinln(1+3x)[ln(1+3x)]'(1+3x)'=-3sinln(1+3x)[1/(1+3x)]=[-3sinln(1+3x)]/(1+3x)