In the calculator, Tan (45) = 1, but arctan (1) = 57.289 why is this number, not equal to 45?

In the calculator, Tan (45) = 1, but arctan (1) = 57.289 why is this number, not equal to 45?


arctan(1)=45



What are arctan √ 3 and arctan (1 / √ 3) equal to


60°
30°

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