设a为锐角,若sina=?则a=?若tan a=根号3\3,则a=?
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设a为锐角,若sina=?则a=?若tan a=根号3\3,则a=?
设a为锐角,若sina=?则a=?若tan a=根号3\3,则a=?
设a为锐角,若sina=?则a=?若tan a=根号3\3,则a=?
sina=?,a=arcsin?.tana=根号3/3,a=30du