ATAN

The ATAN function returns the inverse tangent (arctangent) of a number.

ATAN(num)

num: A number value.

Notes

  • The ATAN function takes a tangent and returns the corresponding angle, expressed in radians in the range –π/2 to +π/2 (–pi/2 to +pi/2). To see the resulting angle in degrees instead of radians, wrap this function in the DEGREES function; that is, =DEGREES(ATAN(num)).

Examples

=ATAN(1) returns the angle measure 0.785398163397448 radians (45 degrees), which has a tangent of 1.

=DEGREES(ATAN(1)) returns 45.

See alsoATAN2ATANHDEGREESTANTANH
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