It can graph derivatives, it can do integrals, explicit differentiation, and area under/between the curve(s). It auto-detects roots and intersections to choose boundaries, It is fast, It can graph 20 equations at a time, The batteries last 1 month+, It has y and x calc, it can even graph Y= X= r= and > < >= <= functions on the same graph. It also lets you go between the functions and graph without redrawing the graph! It can auto-generate tables from functions that include the derivative at that point, do conic graphing, run python, do 3d graphing, and even more that It even has Stat and Financial programs! It is like the Swiss army knife of calculators, and if it can't do something, look for a python script online that can do it, and load it onto the calculator from your computer!