/ 2 \ / 1 1 \
\16*a - 49/*|------- - -------|
\4*a - 7 4*a + 7/(-49.0 + 16.0*a^2)*(1/(-7.0 + 4.0*a) - 1/(7.0 + 4.0*a))
2 -686 + 224*a -------------------- (-7 + 4*a)*(7 + 4*a)
/ 2\ 14*\-49 + 16*a / -------------------- (-7 + 4*a)*(7 + 4*a)