∫(2x+3)/(x^2+1)dx如何解?
1个回答
∫(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
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