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在求∫√9-x2dx|时，为使被积函数有理化，可作变换（）
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在求∫√9-x2dx|时，为使被积函数有理化，可作变换（）
A、x=3sin t+
B、x=3tan t
C、x=3sec t
D、.t=√x2
时间：2021-09-01 16:03
关键词：
弘成
兰州财经 大学
高等数学
答案解析
A
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