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求1+2x2分之x^2(1+x2)的不定积分

题目详情
求1+2x2分之x^2(1+x2)的不定积分
▼优质解答
答案和解析
x^2(1+x^2) = (1/4)x^2(1+2x^2) + (3/8)( 1+ 2x^2) - 3/8x^2(1+x^2)/(1+2x^2) =(1/4)x^2 + (3/8) - (3/8)[1/(1+2x^2)]∫[x^2(1+x^2)/(1+2x^2)] dx =∫ { (1/4)x^2 + (3/8) - (3/8)[1/(1+2x^2)] } dx ...