त्रिभुज ABC में angleBCA = 60^(@) और AB^...

त्रिभुज ABC में `angleBCA = 60^(@) और `AB^2 = BC^2 + CA^2 + X` है। X किसके बराबर है?

A

(BC)(CA)

B

`-(BC)(CA)`

C

(AB)(BC)

D

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