Limit the fractional part

Calculus Level 3

Compute \[ \lim _{ x \rightarrow { { n }^{ - }} }{ \frac { { e }^{\{ x \} }-\{ x \} -1 }{ { \{ x \} }^{ 2 } } } \]

Where \(\{.\}\) represents the fractional part function and \( n \) is an integer.