[" 23.If "A,B,C,D" are the angles of a q...

[" 23.If "A,B,C,D" are the angles of a quadrilateral then "tan((A+B)/(4))=],[[" 1) "cos((C-D)/(4))," 2) "cot((C-D)/(4))," 3) "cos((C+D)/(4))," 4) "cot((C+D)/(4))]]

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