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atan(expr0) ⇒ number
The atan() function returns the inverse tangent or arctangent of the argument as a number. The result is returned as a radian angle. The corresponding mathematical notations are:
atan(x) returns a numeric value between and radians.
Use the calculator at the top right of the window to find the inverse tangent of a number. Click the [2nd] key at the top left of the keypad, then click [atan].