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To Know Everyone Knows Identities - 4?

Algebra Level 2

What is the Simplified Form of :

$\color{#20A900}{a^2 + b^2 + c^2 - 2ab + 2bc - 2ca}$

(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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