arctan(-2)+arctan(-3)=?
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arctan(-2)+arctan(-3)=?
arctan(-2)+arctan(-3)=?
arctan(-2)+arctan(-3)=?
tan[arctan(-2)+arctan(-3)]
=-2-3/1-6(用余切公式)
=1
所以arctan(-2)+arctan(-3)=45度或225度
arctan(-2)+arctan(-3)=?
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