Find $dy/dx$ if $y = \frac{\cos x}{x \ln 2}$.
University of Ilorin MTH102 2025A past question
- $\frac{-(x\sin x + \cos x)}{x^2 \ln 2}$
- $\frac{x\sin x + \cos x}{x^2 \ln 2}$
- $\frac{-(x\sin x - \cos x)}{x^2 \ln 2}$
- $\frac{-\sin x}{x \ln 2}$
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