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p { margin-bottom: 0.25cm; line-height: 120%; } P rove that in a quadrilateral ABCD:- cosA+cosB+cosC+cosD+4cos{(A+B)/2}cos{(A+C)/2}cos{(A+D)/2}=0

p { margin-bottom: 0.25cm; line-height: 120%; }

Prove that in a quadrilateral ABCD:-

cosA+cosB+cosC+cosD+4cos{(A+B)/2}cos{(A+C)/2}cos{(A+D)/2}=0

Grade:11

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