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In a triangle ABC , if angle A=60 , ...

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 -10 c + 25 =0`

D

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

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The correct Answer is:
B
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