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