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不定積分的方法換元法換元法(一):設f(u)具有原函數F(u),u=g(x)可導,那末F[g(x)]是f[g(x)]g'(x)的原函數.即有換元公式:例題:求這個積分在基本積分表中是查不到的,故我們要利用換元法.設u=2x,那末cos2x=cosu…
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