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Calculator Software
I occured to me that many people have these calculators which can be programmed, but do not have the time or patience to write any programs. In many cases, the calculator can do a task you do regularly much more quickly through a program. Here are some programs which can be inputted into Casio calculators (fx-6300G and fx-7000CFX tested), which I use regularly.

Solutions To Quadratics :

"A="?A:"B="?B:"C="?C:"X INT 1="((-1xB)+(B^2-(4xAxC)))/(2xA)"X INT 2="((-1xB)-(B^2-(4xAxC)))/(2xA)Graph Y=AX^2+BX+C

Solution To Cosine Rule :

"B="?B:"C="?C:" A="?D:((B^2+C^2-(2xBxCxCosD)))A:"A=":A

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More programs can be found here.