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In a triangle ABC if angle A= 60^@,a=5,b...

In a triangle ABC if `angle A= 60^@`,a=5,b= 4, then c is a root of the equation :

A

`c^2-5c-9=0`

B

`c^2-4c-9=0`

C

`c^2-10c + 25 = 0`

D

`c^2-5c-41 = 0`.

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