Description

   acos() computes the principal value of the arc cosine of x in the
   interval [0,pi] radians for x in the interval [-1,1].

   acosd() computes the principal value of the arc cosine of x in
   the interval [0,180] degrees for x in the interval [-1,1].


                          Entry-Point Names

   Generic
   Function   Data Type   OpenVMS        Tru64 UNIX
   Name       Required

   acos       S_FLOAT     math$acos_s    acosf
              T_FLOAT     math$acos_t    acos
              X_FLOAT     math$acos_x    acosl
              F_FLOAT     math$acos_f
              G_FLOAT     math$acos_g

   acosd      S_FLOAT     math$acosd_s   acosdf
              T_FLOAT     math$acosd_t   acosd
              X_FLOAT     math$acosd_x   acosdl
              F_FLOAT     math$acosd_f
              G_FLOAT     math$acosd_g