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ATAN

Description

Returns the arctangent (the inverse of the tangent function) of the specified number. The arctangent is the angle whose tangent is the specified number. The resulting angle is given in radians in the range pi/2 to pi/2.

Examples

ATAN(0.5) = 0.46364760900081

ATAN(3) = 1.2490457723983

ATAN(NAN) = NAN

ATAN(INF) = 1.5707963267949

ATAN(-INF) = -1.5707963267949

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