求∫1/[x^2根号(x^2+1)]dx的不定积分
求∫1/[x^2根号(x^2+1)]dx的不定积分
数学人气:204 ℃时间:2020-03-09 20:31:11
优质解答
x=tanadx=sec²ada原式=∫sec²ada/tan²a*seca=∫secada/tan²a=∫da/sina∫sinada/sin²a=∫dcosa/(cos²a-1)=(1/2)[∫dcosa/(cosa-1)-∫dcosa/(cosa+1)]=(1/2)(ln|cosa-1|-ln|cosa+1|)+C...
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