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In a Quadrilateral ABCD, cos A.cosB + si...

In a Quadrilateral ABCD, `cos A.cosB + sin C sin D= `

A

`cos C cos D + sin A sin B`

B

`cos C cos D- sin A sin B`

C

`sin C sin D - cos A cos B`

D

`sin A + sin B + sin C + sin D`

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