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[" A-B.Let a,b and "c" be the sides of a...

[" A-B.Let a,b and "c" be the sides of a "/_ABC" .If "a^(2),b^(2)" and "c^(2)" are the roots of the equation "],[x^(3)-Px^(2)+Qx-R=0" ,where "P,Q&R" are constants,then find the value of "(cos A)/(a)+(cosf)/(b)],[" terms of "P,Q" and "R.]

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