$\frac{d}{dx} (\cos \frac{1}{x})$ এর মান কোনটি? (ক) $-\frac{1}{x^2} \cos \frac{1}{x}$ (খ) $-\frac{1}{x^2} \sin \frac{1}{x}$ (গ) $\frac{1}{x^2} \sin \frac{1}{x}$ (ঘ) $\frac{1}{x^2} \cos \frac{1}{x}$

ID#7052 HSC Higher Math 1st MCQ (Dinajpur 2023)

$\frac{d}{dx} (\cos \frac{1}{x})$ এর মান কোনটি?

ক) (ক) $-\frac{1}{x^2} \cos \frac{1}{x}$

খ) (খ) $-\frac{1}{x^2} \sin \frac{1}{x}$

গ) (গ) $\frac{1}{x^2} \sin \frac{1}{x}$

ঘ) (ঘ) $\frac{1}{x^2} \cos \frac{1}{x}$

গ

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