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Sorry I can't understand
sorry I don't know my friend
sorry I don't know my friend
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using (a+b)(a-b)=a^2-b^2
{(√99)^2}-(70√2)^2
=99-4900*2
=9899
{(√99)^2}-(70√2)^2
=99-4900*2
=9899
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