回复：求救 - 高中生的定积分题

来源: yma16 于 2008-07-21 12:46:01 [] [旧帖] [给我悄悄话] 本文已被阅读： 0 次 (164 bytes)
The problem is valid. But it should not be a probelm in a test, since it cannot represented as a formula such that people can plug in 0 and pi/2 to get the result.
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