A Value Of $\sinh x$ Or $\cosh x$ Is Given Use the Definitions and the Identity

Multiple Choice

A value of $\sinh x$ or $\cosh x$ is given. Use the definitions and the identity $\cosh ^ { 2 } x - \sinh ^ { 2 } x = 1$ to find the value of the other indicated hyperbolic function.
- $\sinh x = - \frac { 4 } { 3 } , \tanh x =$

A) $- \frac { 5 } { 4 }$
B) $\frac { 5 } { 3 }$
C) $- \frac { 4 } { 5 }$
D) $\frac { 4 } { 5 }$