微积分Evaluate the indefinite integral.Evaluate the indefinite integral.(Remember to use ln(abs(u)) where appropriate.) (1+4x)/(1+x^2) dx 数学
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【答案】 (1+4x)/(1+x^2)dx的indefinite integral=1/(1+x^2)dx的indefinite integral+4x/(1+x^2)dx的indefinite integral
=arctanx+2*ln(abs(1+x^2))+C