Translations:Documentation/Calc Functions/ACOS/19/en

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Formula Description Returns
=ACOS(-1) Inverse trigonometric cosine of -1 3.14159265358979 (PI radians or π)
=ACOS(0.5) Inverse trigonometric cosine of 0.5 1.0471975511966 (radians)
=DEGREES(ACOS(0.5)) Inverse trigonometric cosine of 0.5. Further, converting angle in radians to degrees. 60° (degrees)
=ACOS(-0.5)*180/PI() Inverse trigonometric cosine of -0.5. Further, converting angle in radians to degrees by multiplying by 180/PI(). 120° (degrees)
=ACOS(2) Inverse trigonometric cosine of 2 will return an invalid numeric value (#NUM!) error because 2 is out of its domain. #NUM!