(36)原卖斗式=lnarcsinx+C(38) 原式=1/2∫(2x+3+1)/庆辩(x^2+3x+4)dx =1/2 ln|x^2+3x+4|+1/2∫dx/[(x+3/2)^2+7/4] =1/2 ln|x^2+3x+4|+2/7∫dx/{[(2x+3)/√7]^2+1} =1/誉配缺2*ln|x^2+3x+4|+√7/7arctan[(2x+3)/√7]+C
30题在哪里??