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The Calculator App, like the Stocks App, is exactly what its name implies. It's a calculator. Upon launch, all your expected calculator functions are there; addition, subtraction, multiplication, division, plus/minus and the memory addition-subtraction recall and clear buttons. However, turn your iPhone to Landscape mode and the calculator expands to a scientific calculator, adding geometric, trigonometric, and logarithmic functions, as well as calculations for working with exponents, roots, and factorials.
I won't go into the function of each and every button here, but if you ever need to run a calculation that's of a complexity between figuring out a tip at dinner and predicting when a rogue comet is going to hit the Earth, chances are you can use the iPhone's calculator.
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