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To Know Everyone Knows Identities - 4?

Algebra Level 2

What is the Simplified Form of :

\(\color {green}{a^2 + b^2 + c^2 - 2ab + 2bc - 2ca}\)

\[(a+b-c)^2\] \[(a-b-c)^2\] \[(a+b+c)^2\] \[(-a+b-c)^2\] \[(a-b+c)^2\]

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by Anish Harsha

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