acos(3F)

NAME
     acos, dacos, qacos, acosd, dacosd, qacosd - FORTRAN arccosine intrinsic
     function

SYNOPSIS
     real r1, r2
     double precision dp1, dp2
     real*16 qp1, qp2
     real*4 r3, r4
     real*8 dp3, dp4
     real*16 qp3, qp4

     r2 = acos(r1)

     dp2 = dacos(dp1)
     dp2 = acos(dp1)

     qp2 = qacos(qp1)
     qp2 = acos(qp1)

     r4 = acosd(r3)

     dp4 = dacosd(dp3)
     dp4 = acosd(dp3)

     qp4 = qacosd(qp3)
     qp4 = acosd(qp3)

DESCRIPTION
     acos returns the real arccosine of its real argument, dacos returns the
     double-precision arccosine of its double-precision argument, and qacos
     returns the real*16 arccosine of its real*16 argument.  The absolute
     value of the arguments for acos, dacos, and qacos must be less than or
     equal to one.  The result is in radians and is in the range 0 <=  result
     <= Pi.  The generic form acos may be used with impunity as it derives its
     type from that of its argument.

     acosd returns the real*4 arccosine of its real*4 argument, dacosd returns
     the real*8 arccosine of its real*8 argument, and qacosd returns the
     real*16 arccosine of its real*16 argument.  The absolute value of the
     arguments for acosd, dacosd, and qacosd must be less than or equal to
     one.  The result is in degrees and is in the range 0 <=  result <= 180.
     The generic form acosd may be used with impunity as it derives its type
     from that of its argument.

SEE ALSO
     trig(3M).