Question

a^2+b^2
${ a}^{2} + {b}^{2}$
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Answer 1

we have know that,

${a + b}^{2} = {a}^{2} + {b}^{2} + 2ab \\ = > {a}^{2} + {b}^{2} = ({a + b})^{2} - 2ab$

Hope it helps to you.