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In a Delta ABC, the side a, b, and c a...

In a `Delta ABC,` the side a, b, and c are such that they are roots of `x^(3) -11x ^(2) +38x -40=0.` Then the value of `(cos A)/(a )+ (cos B)/(b)+ (cos C)/(c ).`

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The correct Answer is:
`((9)/(16))`
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