Principle Of Mathematical Induction

Question
CBSEENMA11013693

A, B, C, D are angles of a cyclic quadrilateral, prove that:

cos space left parenthesis 180 degree minus straight A right parenthesis plus cos space left parenthesis 180 degree plus straight B right parenthesis plus cos space left parenthesis 180 degree plus straight C right parenthesis minus sin space left parenthesis 90 degree plus straight D right parenthesis equals 0

Solution

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