问题标题:
∫(12)x根号下x^2-1dx∫(12)是它的上下标
问题描述:
∫(12)x根号下x^2-1dx
∫(12)是它的上下标
潘红回答:
先不写上下标
∫x√(x²-1)dx
=(1/2)∫√(x²-1)dx²
=(1/2)∫√(x²-1)d(x²-1)
=(1/2)∫√(x²-1)d(x²-1)
=(1/2)×(2/3)×(x²-1)^(3/2)
=(1/3)(x²-1)^(3/2)
带入上下标之后:
=(1/3)(1)^(3/2)-(1/3)(0)^(3/2)
=1/3
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