2 x 36 -------- - -------- 2 2 (x - 6) (6 - x)
-36.0/(6.0 - x)^2 + x^2/(-6.0 + x)^2
2 2 2 - 36*(-6 + x) + x *(6 - x) ---------------------------- 2 2 (-6 + x) *(6 - x)
6 + x ------ -6 + x
12 1 + ------ -6 + x