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利用换元法求不定积分 ∫x*√(x^2+3)dx
人气:108 ℃ 时间:2020-05-08 20:27:06
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请问,在利用第二换元法求不定积分∫(a^2-x^2)dx ,a>0时,可令x=asint,(-π/2≤t≤π/2),得√(a^2-x^2)=a√(1-sin^2t)=acoxt,dx=acostdt
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