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The ATAN function

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**beingchinmay**:

The ATAN function returns the inverse tangent. The specification for the ATAN function is:

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**richardmsmith**:

The Atan function is a Number Request that calculates the value (in radians) of the angle whose tangent equals a specified number.

The arctangent function is the inverse function of the tangent function and calculates the angle for a given tangent x.

**brookeroberts7**:

The Atan function is a Number Request that calculates the value (in radians) of the angle whose tangent equals a specified number (the inverse of the Tan function). In the diagram below, the arc tangent of b/a is X. The units of X are radians. Arc tangent is sometimes written tan-1.

**dark404**:

The Atan function is a Number Request that calculates the value (in radians) of the angle whose tangent equals a specified number.

The arctangent function is the inverse function of the tangent function and calculates the angle for a given tangent x.

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