Question:`x + 1/x = 4` হলে প্রমাণ কর যে, `x^3 + 1/x^3 = 52` 

Answer দেওয়া আছে, `x + 1/x = 4` বা, `(x + 1/x)^3 = (4)^3` [ঘন করে] বা, `x^3 + 1/x^3 + 3. x. 1/x (x + 1/x) = 64` বা, `x^3 + 1/x^3 + 3. 4 = 64 [:. x + 1/x = 4]` বা, `x^3 + 1/x^3 = 64 - 12` ` :. x^3 + 1/x^3 = 52` 

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`x + 1/x = 4` hole proman kar je, `x^3 + 1/x^3 = 52`
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