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─────Trigonometric Functions────────────────────────────────────────────────
 
     All angles in trigonometric intrinsic functions are specified in
     radians.
 
     Restrictions on Arguments and Results
 
                        Restrictions           Range of
     Function           on Arguments           Results
 
     SIN, DSIN, COS,    None                   All real numbers
     DCOS, TAN, DTAN
 
     ASIN, DASIN        |arg| <= 1            -π/2 <= result <= π/2
 
     ACOS, DACOS        |arg| <= 1              0  <= result <=  π
 
     ATAN, DATAN        None                   -π/2 <= result <= π/2
 
     ATAN2, DATAN2      Arguments cannot        -π  <= result <=  π
                        both be zero
 
     COTAN              Argument cannot        All real numbers
                        be zero
 
     The range of the results of the intrinsic functions ATAN2 and
     DATAN2 is as follows:
 
     Arguments                Result
 
     genA > 0                 result  >  0
 
     genA = 0 and genB > 0    result  =  0
 
     genA = 0 and genB < 0    result  =  π
 
     genA < 0                 result  <  0
 
     genB = 0                |result| = π/2
                                    -♦-