ATAN returns a trigonometric arc tangent of a numerical expression

Syntax

ATAN(NumExp)

Arguments 

• NumExp is a numerical expression

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1. ATAN returns the angle with a tangent of NumExp. The result is in Radians
2. Please also look at ATAN2 ATAN2, because of quadrant issues

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An example knowledgebase of this function can be downloaded downloaded here.

Description

The example knowledge base contains all trigonometric functions. 

Wikipedia: [Inverse trigonometric function] | [Trigonometric function]

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