∫(2x+3)/(x^2+1)dx如何解?
问题描述:
∫(2x+3)/(x^2+1)dx如何解?
答
∫(2x+3)/(x^2+1)dx
=∫2x2x/(x^2+1)dx+∫3/(x^2+1)dx
=∫1/(x^2+1)dx^2+3∫/(x^2+1)dx
=Ln(x^2+1)+3arctanx+c