Casio FX991EX

[lrdheat]

The 991EX is a nice calculator. My only wishes would be that it could retain the work when turned off. Turning it off clears the history. Also, when creating a table of x and f(x), I wish that that "f(x)" would still be available to utilize in the calculation mode. Instead, one must retype the equation of interest.

A neat item, at least on the 991EX version, is that one can solve a derivative to =0, so as to find a maximum or minimum of a function! Likewise, one can solve an integral to equal some value of interest, say, "3", where one of the interval points over which the integral is evaluated, is defined.