দেওয়া আছে,
$x-\frac{1}{x}=p$
বা, $\left(x-\frac{1}{x}\right)^3=\left(p\right)^3$
[ উভয় পার্শ্বে ঘন করে ]
বা, $x^3-\frac{1}{x^3}-3\cdot x\cdot\frac{1}{x}\left(x-\frac{1}{x}\right)=p^3$
বা, $x^3-\frac{1}{x^3}-3\cdot p=p^3$
[ মান বসিয়ে ]
$\therefore a^3-\frac{1}{a^3}=p^3+3p$ [Showed]
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