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ATAN function


Arc tangent function. ATAN(x) returns the arc tangent of x. The arc tangent function is the inverse function of the tangent function and calculates the angle for a given tangent x. The result is an angle expressed in radians. To convert from radians to degrees, use the DEGREES function.

The argument x can be a real number, a complex number, or a matrix. When it is a matrix, the function returns a matrix with the same dimensions and with the ATAN function applied to all elements.


ATAN(0) equals 0

ATAN(1) equals 0.78539816 (=PI/4)




ATAN function

Relation with ASIN ans ACOS functions

Relation of ASIN with ACOS and ATAN functions

Related functions

External links

Recommended book

Book cover

Trigonometry: A Complete Introduction
Hugh Neill

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This book covers all areas of trigonometry including the theory and equations of tangent, sine and cosine, using trigonometry in three dimensions and for angles for any magnitude, related to triangles. Everything you will need is here in this one book. Each chapter includes not only an explanation of the knowledge and skills you need, but also worked examples and test questions.