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a^2-b^2-4ac+4c^2...

`a^2-b^2-4ac+4c^2`

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Verified by Experts

The correct Answer is:
`(a-2c+b)(a-2c-b)`
`a^2-b^2-4ac+4c^2=(a^2-4ac+4c^2)-b^2=(a-2c)^2-b^2`
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