ATAN function

ATAN returns the inverse trigonometric tangent of a number.

Syntax

ATAN (number)

This function returns the inverse trigonometric tangent of number, which is the angle (in radians) whose tangent is Number. The angle returned is between -PI/2 and PI/2.

Example

=ATAN(1) returns 0.785398163397448 (PI/4 radians)..

=DEGREES(ATAN(1)) returns 45. The tangent of 45 degrees is 1.




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