If A,B,C,D are angles of a cyclic quadrilateral, then P.T. a) sinA-sinC=sinD-sinB b)cosA+cosB+cosC+cosD=0
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b
https://www.meritnation.com/ask-answer/question/if-a-b-c-d-are-the-angles-of-a-cyclic-quadrilateral-prov/trigonometric-functions/2089871
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b
https://www.meritnation.com/ask-answer/question/if-a-b-c-d-are-the-angles-of-a-cyclic-quadrilateral-prov/trigonometric-functions/2089871
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