/ 2 2*x / 2 \ \ 2*|1 + tan (x) - ----------- + x*\1 + tan (x)/*tan(x)| | 3/2 | | / 2\ | \ \1 - x / /
/ 2 2 \ | 2 / 2 \ 6*x / 2 \ 2 / 2 \| 2*|- ----------- + x*\1 + tan (x)/ - ----------- + 3*\1 + tan (x)/*tan(x) + 2*x*tan (x)*\1 + tan (x)/| | 3/2 5/2 | | / 2\ / 2\ | \ \1 - x / \1 - x / /