(cosh(x) - x)*sin(h) + x*(-1 + sinh(x))*sin(h)
$$x \left(\sinh{\left(x \right)} - 1\right) \sin{\left(h \right)} + \left(- x + \cosh{\left(x \right)}\right) \sin{\left(h \right)}$$
(-2 + 2*sinh(x) + x*cosh(x))*sin(h)
$$\left(x \cosh{\left(x \right)} + 2 \sinh{\left(x \right)} - 2\right) \sin{\left(h \right)}$$
(3*cosh(x) + x*sinh(x))*sin(h)
$$\left(x \sinh{\left(x \right)} + 3 \cosh{\left(x \right)}\right) \sin{\left(h \right)}$$