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尝试用替换法计算 integrate sec^3 x dx 。指出为什么简单替换在此失效,并写出答案(需要分部积分,第 85 课)。
尝试用替换法计算 integrate sec^3 x dx 。指出为什么简单替换在此失效,并写出答案(需要分部积分,第 85 课)。
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