a + b + c = 2s, అప్పుడు [(s – a)2 + (s – b)2 + (s – c)2 + s2] = ?

1
(s2 – a2 – b2 – c2)
2
(s2 + a2 + b2 + c2)
3
(a2 + b2 + c2)
4
(4s2 – a2 – b2 – c2)

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