-log((2*sqrt(1 - a^2))/|a| + 2/|a|)
/ / ________\\ | | / 2 || |2*\1 + \/ 1 - a /| -log|-------------------| \ |a| /
/ / ________\\ | | / 2 || |2*\1 + \/ 1 - a /| -log|-------------------| \ |a| /
/ / ________\\ | | / 2 || |2*\1 + \/ 1 - a /| -log|-------------------| \ |a| /
/ ________\ | / 2 | | 1 \/ 1 - a | -log(2) - log|--- + -----------| \|a| |a| /