ATAN

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Returns the arctangent, or inverse tangent, of a number. The arctangent is the angle whose tangent is number. The returned angle is given in radians in the range -pi/2 to pi/2.

Syntax

ATAN ( number )

Number is the tangent of the angle you want.

Remark

To express the arctangent in degrees, multiply the result by 180/PI() or use the DEGREES function.

Example

Formula

Description (Result)

=ATAN(1)

Arctangent of 1 in radians, pi/4 (0.785398)

=ATAN(1)*180/PI()

Arctangent of 1 in degrees (45)

=DEGREES(ATAN(1))

Arctangent of 1 in degrees (45)

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