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The usage of pi (π) on various calculators, including the TI-84 Plus, Casio fx-82AU II, Prinztronic Micro Calculator, and ClassWiz, involves accessing either a built-in constant or using trigonometric functions to approximate its value. On the TI-84 Plus, pi can be accessed by pressing the MATH button and selecting the constant π from the list. The Casio fx-82AU II typically has a dedicated π button. Prinztronic and ClassWiz calculators may require using trigonometric identities like sin(π/2) = 1 to derive pi. These calculators offer different methods for enjoying an approximation of pi, tailored to their specific interfaces and functionalities.

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