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August 28, 2015

Homework Help: maths-

Posted by anoynomous on Tuesday, April 9, 2013 at 11:46am.

A and B are two different values of C lying between 0 and 360 which satisfy the equation (p cosC + q sinC=r) then prove that cos(A+B)=(p^2- q^2)/(p^2+ q^2)

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