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यदि A,B,C,D चक्रीय चतुर्भुज के कोण...

यदि A,B,C,D चक्रीय चतुर्भुज के कोण है , तो सिद्ध कीजिए कि -
(i) cos A + cos B + cos C + cos D = 0
(ii) ` cos ( 180^(@) - A) + cos ( 180^(@) + B) + cos ( 180^(@)+ C) - sin ( 90^(@) + D ) = 0 ` .

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