![tan1/2是多少度]( "tan1/2是多少度")
- tan1/2≈26°33’54.18tanθ=1/2θ=arctan1/2=26.565051177077989351572193720453.°=26°33.903070624679361094331623227198.’=26°33’54.184237480761665659897393631861.≈26°33’54.18角θ在任意直...
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