[" 17.If "A,B,C&D" are the angle of a cy...

[" 17.If "A,B,C&D" are the angle of a cyclic quadrilateral "ABCD" ,then value of "cos A+cos B+cos C+cos D],[" equal to "],[[" (a) "sin^(2)A+cos^(2)A," (b) "sin^(2)B+cos^(2)B," (c) "sin^(2)A+sin^(2)B," (d) "cos^(2)A+cos^(2)B]]

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