Texas Instruments TI-89 Titanium Graphing Calculator Review

Very bad keyboard design, because is not like the ti-83, where you can press once to calculate sine, cosine, or tangent. On this calculator, they replace those three MAIN buttons for y,z,t. As a result if someone wants to calculate or graph sin (x), he must press the key "2nd" "Y", ridiculous pain in the neck.

But graphing, taking the derivatives, and integrating is way much faster than the TI Voyage 200. Also it has better documentation, the rest is the same operating system.

Buy it here now!