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If a-b=4 and a b=21 , find the value of ...

If `a-b=4` and `a b=21 ,` find the value of `a^3-b^3`

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If a - b = 4 and a^3-b^3=88 , then find the value of a^2-b^2 . यदि a - b = 4 और a^3-b^3=88 है, तो a^2-b^2 का मान ज्ञात कीजिए।