Returns the value of e x .
math:exp( $arg as xs:double?xs:double?If $arg is the empty sequence, the function returns the empty sequence.
Otherwise the result is the mathematical constant e raised to the power of
$arg, as defined in the specification of
the exp function applied to 64-bit binary floating point values.
The expression math:exp(()) returns ().
The expression math:exp(0) returns 1.0e0.
The expression math:exp(1) returns 2.7182818284590455e0.
The expression math:exp(2) returns 7.38905609893065e0.
The expression math:exp(-1) returns 0.36787944117144233e0.
The expression math:exp(math:pi()) returns 23.140692632779267e0.
The expression math:exp(xs:double('NaN')) returns xs:double('NaN').
The expression math:exp(xs:double('INF')) returns xs:double('INF').
The expression math:exp(xs:double('-INF')) returns 0.0e0.
The treatment of overflow and underflow is defined in .