# How do you compute d/dx 3sinh(3/x)?

$\frac{d}{\mathrm{dx}} 3 \sinh \left(\frac{3}{x}\right) = 3 \cosh \left(\frac{3}{x}\right) \cdot \left(- \frac{3}{x} ^ 2\right) = - \frac{9}{x} ^ 2 \cosh \left(\frac{3}{x}\right)$.