12ex+e-1 ধারাটির বিস্তৃতি কোনটি?
A
1+x22!+x44!+.........
B
1-x22!+x44!+.........
C
1+x33!+x55!+.........
D
1-x33!+x55!+.........
Correct Answer: 1+x22!+x44!+.........