求积分xdx/(x+√x^2+1)

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求积分xdx/(x+√x^2+1)
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求积分xdx/(x+√x^2+1)
求积分xdx/(x+√x^2+1)

求积分xdx/(x+√x^2+1)
先分母有理化:

∫xdx/[x+√(x^2+1)]=∫x[√(x^2+1)-x]dx=∫x√(x^2+1)dx-x^3/3=1/2∫√(x^2+1)d(x^2+1)-x^3/3=(1/2*2/3)(x^2+1)^(3/2)-x^3/3+c=1/3(x^2+1)^(3/2)-x^3/3+c,其中c为常数