How to solve trigonometric equation using python?

I have this code. What is the best way to solve these king of trigonometric equations?

    A= 1
 B = 0.6
  from scipy.optimize import fsolve

    from scipy import optimize

    def func(x):

            return((((A**2) + (B**2)*np.cos(A*x)*np.cos(B*x))  + ( (A**3) *np.sinh(A*x)*np.cos(B*x)) - ((B**3) *np.sin(B*x)*np.cosh(A*x))))

        root = fsolve(func, 21.5)