I have a TI-86 and i don't have a clue how to make it do anything but add, subtract, multiply and divide.
Remember DF, a whole slew of people went through Algerbra, Trig and other classes without graphing caculators being around.
Oh and in my high school math classes we wern't supposed to use anythng but a basic caculator and in college no caculators for several of the classes. Gotta learn to do it by hand first.