This arctan calculator works the other way round as well, that is as a standard tangent calculator - type the angle into the second box and tangent of that angle will appear. As we expected, the arctan of 1 is equal to 45degree 45°. to define the multivalued version of each inverse trigonometric function: e.g. Just type in the number and the inverse tangent calculator will display the result. The licensing service we use, Paddle is ok, although it can cause some issues so I apologize to anyone who had problems with it. I just released version 2.53 which now has support for Apple Silicon and macOS Big Sur. The notations sin −1( x), cos −1( x), tan −1( x), etc., as introduced by John Herschel in 1813, are often used as well in English-language sources, much more than the also established sin ( x), cos ( x), tan ( x),-conventions consistent with the notation of an inverse function, that is useful e.g. Thanks guys for the kind words about TG Pro, I work really hard to keep it updated with new Mac and OS support. In computer programming languages, the inverse trigonometric functions are often called by the abbreviated forms asin, acos, atan. Thus in the unit circle, "the arc whose cosine is x" is the same as "the angle whose cosine is x", because the length of the arc of the circle in radii is the same as the measurement of the angle in radians. When measuring in radians, an angle of θ radians will correspond to an arc whose length is rθ, where r is the radius of the circle. ![]() ![]() (This convention is used throughout this article.) This notation arises from the following geometric relationships: The most common convention is to name inverse trigonometric functions using an arc- prefix: arcsin( x), arccos( x), arctan( x), etc. Several notations for the inverse trigonometric functions exist. See also: Trigonometric functions § Notation
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