2.1.4. Finding the numerical value of the hyperbolic functions Examples 1: a) Find the value of cosh 3. b) If sech x = =, find the value of cosh 2x. c) Find the value of sech [tanh (In 2)]. Example 2: Prove the following identity using the definition of hyperbolic functions. cosh20 - 1 = sinh20. Example 3: Solve the following equation by using the definition of hyperbolic functions. 3 cosh x - 2 sinh x - 3 = 0