Question

differentiate the function of f(x) = coshx / x

Answer 1

you need the quotient rule for this one
\[\left(\frac{f}{g}\right)'=\frac{gf'-fg'}{g^2}\] with
\[f(x)=\cosh(x), f'(x)=\sinh(x), g(x)=x,g'(x)=1\]