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In a quadrilateral if sin(A+B)/2cos(A-B...

In a quadrilateral if `sin(A+B)/2cos(A-B)/2+sin(c+D)/2cos(c-D)/2=2,` then `cosA/2cosB/2+cosA/2cosc/2+cosA/2 cosD/2+cosB/2 cosC/2+cosB/2 cosD/2+cosC/2 cosD/2=`

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