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If A, B, C, D are the angles of a quadri...

If A, B, C, D are the angles of a quadrilateral, then show that
(i) `tan((A+B)/(4) ) = cot((C+D)/(4))`
(ii) `cos((A+B)/(2))+cos ((C+D)/(2))=0`

Answer

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Knowledge Check

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