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Prove that: `(a-b)^2=a^2-2ab+b^2`

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Prove that: `(a-b)^2=a^2-2ab+b^2`
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`L.H.S. = (a-b)^2 = (a-b)(a-b)`
`=a*a-a*b-b*a-b*b`
`=a^2-2ab+b^2`
`=R.H.S`
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