\( \triangle A B C \) में, \( \angle B=60^{\circ} \), तो सही कथन है- (A) \( (a-c)^{2}=b^{2}-a c ...

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\( \triangle A B C \) में, \( \angle B=60^{\circ} \), तो सही कथन है-
(A) \( (a-c)^{2}=b^{2}-a c \)
(B) \( (a-b)^{2}=c^{2}-a b \)
(C) \( (b-c)^{2}=a^{2}-b c \)
(D) इनमें से कोई नहीं।
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