/ 2 \
| 1 16*x 6*x |
16*|-1 + --------------------- + -------- + --------------------|
| / 2\ 2 2 / 2\ |
\ \1 + 4*x /*atan (2*x) 1 + 4*x \1 + 4*x /*atan(2*x)/
-----------------------------------------------------------------
2
/ 2\
\1 + 4*x / *atan(2*x)