The Calculator app on iPhone lets you perform basic arithmetic: addition, subtraction, multiplication, and division. There are also a few less frequently used functions.
And if you are a student at a university or a researcher, then you probably need an engineering (advanced) calculator with the ability to calculate numbers in powers, tangents and cosines of angles, extract the root from a number, and also calculate its logarithm.
In this case, the standard calculator must be switched to the engineering one.

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