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[" 17.If "ABC" D is a quadrilateral then...

[" 17.If "ABC" D is a quadrilateral then "],[qquad [tan((A+B)/(4))=],[" 1) "cos((C-D)/(4))quad " 2) "cot((C-D)/(4))],[" 3) "cos((C+D)/(4))quad " 4) "cot((C+D)/(4))]]

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