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In a triangle ABC, a= 4, b = 3, `angleA= 60°`. Then, c is the root of the equation

A

`c^(2)-3c-7=0`

B

`c^(2)+3c+7=0`

C

`c^(2)-3c+7=0`

D

`c^(2)+3c-7=0`

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