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if a-b=6 , ab=20 . find a^3-b^3...

if a-b=6 , ab=20 . find `a^3-b^3 `

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`(a-b)^3=a^3-b^3-3ab(a-b)`
`216=a^3-b^3-60(6)`
`a^3-b^3=216+360=576`.
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