420
Glitch in the matrix
(ani.social)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
If you're willing to pirate (or legally generate) a TI calculator ROM, then Graph 89 is probably what you're looking for. This is what I use as my daily driver calculator with a TI-89 ROM.
Graph 89 with my TI-84 Plus Silver yields the bad answer