Arc cosine of a complex number

The function returns the angle, which is the arc cosine of a complex number representing a cosine. The angle is given in radians.

To perform the calculation, enter the complex number. Then click on the 'Calculate' button.

Description of the arccosine

The arc cosine ( Arccos or Acos ) is the inverse of the cosine function. As their inverse functions, the arc cosine returns the associated angle from the cosine value.