expm1(x) calculates the value of ${\ⅇ}^x-1$, where exp(x) is the exponential function of x, that is e to the power of x, where e is the base of the natural logarithm, 2.718281828... .

By default, expm1(x) will evaluate only when the result is an exact value, or when the input x is a floating-point number.  When x is a symbolic expression it will remain in function form so that it can be manipulated symbolically or as part of a larger expression.  

If x is an array, the result is an element-wise mapping over x.

$\mathrm{with}\left(\mathrm{MTM}\right)\:$

$\mathrm{expm1}\left(1.0\right)$

$1.718281828$

$\mathrm{expm1}\left(\mathrm{I}\mathrm{\pi }\right)$

$\mathrm{-2}$

The MTM[expm1] command was introduced in Maple 2021.

For more information on Maple 2021 changes, see Updates in Maple 2021.