1,3c1,3
< *** Error: square root of negative number in sqrt(...).
< *** Error: division by zero in /(...).
< *** Error: logarithm of zero in log(...).
---
> *** Error: square root of negative number in sqrt(-1).
> *** Error: division by zero in 1 / 0.
> *** Error: logarithm of zero in log(0).
