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The Calculator app, like the Stocks app, is exactly what the name implies, a calculator. Upon launch, all of your expected calculator functions are there. Addition, subtraction, multiplication, division, and you also have the memory addition, subtraction, recall and clear buttons. However, if you turn your iPhone to landscape mode, the calculator expands to a scientific calculator, adding geometric, trigonometric and logrithmic functions, as well as calculations working with exponents, roots and factorials. Unfortunately, as of now, the calculator is not available for the iPad but it is available on the iPhone and iPod Touch.
And I'm not going to go into the function of each and every button on here but if you ever need to run a calculation that's of a complexity between say, 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 calculator.
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