Solution
= Solution
The exponential definitions show that $\sinh$ is <odd> and $\cosh$ is <even>. Their quotient therefore satisfies $\boxed{\tanh(-x)=-\tanh x}$.
= Solution
The exponential definitions show that $\sinh$ is <odd> and $\cosh$ is <even>. Their quotient therefore satisfies $\boxed{\tanh(-x)=-\tanh x}$.