Share via Share via... Twitter LinkedIn Facebook Pinterest Telegram WhatsApp Yammer RedditPrintPermalink × Arc Cosine acos( a ) Return the arc cosine of a. Description acos( a ) Return the arc cosine of a in radians. Parameters a Value [-1 to +1] Return value arc cosine of a Example usage acos( 1 ) Returns 0. ezeio2/expref/acos.txt Last modified: 2019-09-02 18:46by andreh Log In