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[" 23.If "A,B,C" are angles in a tiangle...

[" 23.If "A,B,C" are angles in a tiangle,then prove that "cos A+cos B-cos C=-1+4cos(A)/(2)cos(B)/(2)sin(C)/(2)" ."],[qquad " [(TS) March-19,Q23I (TS) Mav-1"]

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