求导 高数 y=ln(x+根号下(1+x^2))

y=ln(x+根号下(1+x^2))y'=1/(x+根号下(1+x^2))*(x+根号下(1+x^2))'=1/(x+根号下(1+x^2))*(1+1/2*2x/根号下(1+x^2))=1/(x+根号下(1+x^2))*(1+x/根号下(1+x^2))=1/(x+根号下(1+x^2))*{[根号下(1+x^2)+x]/根号下(1+x^2)...