Chapter 6.9, Problem 5ES

In each part, a value for one of the hyperbolic functions is given at an unspecified positive number $x_0$ . Use appropriate identities to find the exact values of the remaining five hyperbolic functions at $x_0$ .

(a) $\sinh x_0=2$

(b) $\cosh x_0=\frac{5}{4}$

(c) $\tanh x_0=\frac{4}{5}$