Let a, b and c be the sides of a DeltaA...

Let `a, b and c` be the sides of a `DeltaABC`. 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+ cosB/b+ cos C/c` in terms of `P, Q and R`.

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The correct Answer is:

`(P)/(2sqrt(R ))`

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