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This calculator (as do many other CASIO scientific calculators) uses one and the same key for both the constant π as well as exponents. This works as follows. When you first enter digits, the "EXP"-key will enable you to enter the numbers exponent, otherwise it will enter the constant π.
When I got this calculator it was broken. Literally, the PCB was in halves. I plated them together and fixed the missing print tracks using coil-wire. And it still works great.