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If the sides a, b, c of a triangle ABC a...

If the sides a, b, c of a triangle ABC are the roots of the equation `x^(3)-13x^(2)+54x-72=0`, then the value of `(cosA)/(a)+(cosB)/(b)+(cosC)/(c )` is equal to :

A

`(61)/(144)`

B

`(61)/(72)`

C

`(169)/(144)`

D

`(59)/(144)`

Text Solution

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The correct Answer is:
A
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