$y = x^{-\frac{1}{x}}$ হলে $\frac{dy}{dx} = ?$ Sylhet • 2023 ক (ক) $x^{-2-\frac{1}{x}}(1 - \ln x)$ খ (খ) $x^{\frac{1}{x}+2}(\ln x - 1)$ গ (গ) $x^{-2+\frac{1}{x}}(1 - \ln x)$ ঘ (ঘ) $x^{-2-\frac{1}{x}}(\ln x - 1)$