int_0^1 e ^ (-x ^ 2) dx =?
A. Sigma_(k = 0)^∞ ( (-1)^kx^ (2k))/( 2^ k (k!)^ 2
B. Sigma_(k = 0)^∞ ( (-1)^ k)/(( 2k +1)(k!)
C. Sigma_(k = 0)^∞ ((-1^k) lnx)/( sqrtk k!
D. Sigma_(k = 0)^∞ ( (-1)^ (k+1)x^k)/(k!)
সঠিক উত্তরঃ
B.
Sigma_(k = 0)^∞ ( (-1)^ k)/(( 2k +1)(k!)
Explanation: 
