The first derivative
[src]
cos(3*x)*cosh(x) - 3*sin(3*x)*sinh(x)
$$- 3 \sin{\left(3 x \right)} \sinh{\left(x \right)} + \cos{\left(3 x \right)} \cosh{\left(x \right)}$$
The second derivative
[src]
-2*(3*cosh(x)*sin(3*x) + 4*cos(3*x)*sinh(x))
$$- 2 \left(3 \sin{\left(3 x \right)} \cosh{\left(x \right)} + 4 \cos{\left(3 x \right)} \sinh{\left(x \right)}\right)$$
8*(-117*cosh(x)*sin(3*x) + 44*cos(3*x)*sinh(x))
$$8 \left(- 117 \sin{\left(3 x \right)} \cosh{\left(x \right)} + 44 \cos{\left(3 x \right)} \sinh{\left(x \right)}\right)$$
The third derivative
[src]
2*(-13*cos(3*x)*cosh(x) + 9*sin(3*x)*sinh(x))
$$2 \left(9 \sin{\left(3 x \right)} \sinh{\left(x \right)} - 13 \cos{\left(3 x \right)} \cosh{\left(x \right)}\right)$$