sina+ cosa =tana +1成立?
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sina+ cosa =tana +1成立?
sina+ cosa =tana +1成立?
sina+ cosa =tana +1成立?
tana +1=sina/cosa+1=(sina+cosa)/cosa
要使sina+ cosa =tana +1成立
需要 cosa=1
即a=2kπ,k是整数.