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The calculator does not have a Computer Algebra System or CAS: It cannot handle non numerical quantities. Every letter symbol must have a value stored in it prior to being used. If no value is stored in a letter symbol, value 0 is assigned to it. Sorry. As to calling Pi a variable, I would not got that far, even if the calculator would give me 2Pi. TI calculators that have a CAS are the TI92 Plus, the Voyage 200 PLT, and the TI Nspire CAS, TI Nspire CX CAS.
The calculator has two Input/Output Modes: The MathIO and LineIO modes. Line IO is the old input mode where all symbols are written on a single line. MathIO permits fractions to show as they would in a textbook (a horizontal fraction bar and two squares, one on top and the other at the bottom. Pi can be used as Pi and irrational square roots are displayed with the root symbol. etc,, If you are in MarhIO and you get a result with fractions, radicals, or pi. you can readily convert it to its decimal approximation by pressim the SD key. If you enter some expression with fractions and radicals and you do not want the result displayed with fractions or radicals you press SHIFT = instead of =, Now if you do not care to have ANYTHING displayed as a fraction, radical or with PI, just set the IO mode to the old LineIO. To effect that, press SHIFT MODE to enter the SETUP. Select 2:LineIO. From that moment on you will no longer see a fraction, nor a radical nor PI, e,
If you ever reset the calculator, the MathIO mode will be restored as default IO mode.