test

#!/bin/bash

# e^x = 1 + x + x^2/2! + x^3/3! + x^4/4! + ...x^n/n!

t=1.0
s=0
x=0
n=0

read -r x
read -r n

s=t

for i in {1..n}
do
t=$((  )) # t = (t / j) * x
s=$((s + t)) # s = s + t
done

echo "$s" | bc -l