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It is a function which maps the tangent ratio - any real value - to an angle in the range (-pi/2, pi/2) radians. Or (-90, 90) degrees.

If tan(x) = y then x is the inverse tangent of y.

It is also known as "arc tangent", and spreadsheets, such as Excel, use "atan" for this function.


1/tangent = cotangent is the reciprocal, NOT the inverse.

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โˆ™ 2015-10-11 12:42:31
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Q: What is inverse tangent?
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