How do I switch between degrees and radians?

Press the DEG/RAD button in the top-left of the scientific calculator panel. Trig functions use the selected mode.

What is e in mathematics?

e (Euler's number, ≈ 2.71828) is the base of natural logarithms. It appears naturally in compound growth, probability, and many areas of mathematics.

Enter the number then press the n! button. For example, 5! = 5 × 4 × 3 × 2 × 1 = 120.

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