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∫1/sint dt =∫csc t dt =∫csc t(csc t - cot t)/(csc t - cot t)dt =∫((csc t)^2 -(cot t)(csc t))/(- cot + csct)dt =∫1/(csc t - cot t)d(csc t - cot t) = ln| csc t - cot t | + C 不要只記公式,要記方法和技巧,這方法中包含了一些常用又很大有用的技巧.
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