Explanation: 
Another Explanation (5):
দেওয়া আছে, \( f(x) = x + \frac{1}{x} \)
তাহলে, \( f\left(\frac{1}{x}\right) = \frac{1}{x} + \frac{1}{\frac{1}{x}} = \frac{1}{x} + x \)
সুতরাং,
\( f(x) - f\left(\frac{1}{x}\right) = \left(x + \frac{1}{x}\right) - \left(\frac{1}{x} + x\right) \)
\( = x + \frac{1}{x} - \frac{1}{x} - x \)
\( = 0 \)
অতএব, \( f(x) - f\left(\frac{1}{x}\right) = 0 \) 🥳🎉