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In a triangle ABC a= 4 , b= 3 , `angle A =60 ^@` ,Then c is root of equation :-

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In a triangle ABC a= 4 , b= 3 , `angle A =60 ^@` ,Then c is root of 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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Correct Answer - B
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