Changes

**<math>a</math> is the lower limit.

**<math>a</math> is the lower limit.

**<math>accuracy</math> gives the accurate value of the solution.

**<math>accuracy</math> gives the accurate value of the solution.

*For e.g.,erfc(10),erfc(10,0.01)

*For e.g.,ERFC(10),ERFC(10,0.01)

==Examples==

==Examples==