这道题怎么写 ∫x∧3/√(1+x∧2)∧3dx
问题描述:
这道题怎么写 ∫x∧3/√(1+x∧2)∧3dx
答
∫[x^3/(1+x^2)^(3/2) ]dx=∫[ x(1+x^2)/(1+x^2)^(3/2)]dx - ∫[ x/(1+x^2)^(3/2)]dx=∫[ x/(1+x^2)^(1/2)]dx - ∫[ x/(1+x^2)^(3/2)]dx=(1/2)∫[ 2x/(1+x^2)^(1/2)]dx - (1/2)∫[ 2x/(1+x^2)^(3/2)]dx=√(1+x^2) +[...