The hyperbolic sine function is denoted $\sinh(x)$ and the hyperbolic cosine function is denoted as $\cosh(x)$. These two functions are both defined using either the difference or sum of exponential functions and then dividing by 2:

$\displaystyle \sinh(x) = \frac { e^x-e^{-x} } {2}$

$\displaystyle \cosh(x) = \frac { e^x+e^{-x} } {2}$

$\sinh (0.4) =$

$\cosh (0.4) =$