HP 3000 Manuals

Compiler Library/XL Reference Manual

TAN (or TAN') 

TAN calculates the tangent of a real number in radians.

Declaration 

        FUNCTION TAN(VAR x:REAL):REAL; EXTERNAL;

Accuracy 

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Attributes 

Parameter:                A real number in radians.

Result:                   A real number.

HP FORTRAN 77/XL:         Intrinsic function:  Y=TAN(X)

Error:                    If the argument is a NaN, there are two
                          possible actions.  If the INVALID trap is
                          enabled, the message "TAN(X): X=NaN" occurs.
                          Otherwise, the INVALID flag is set.  In either
                          case, a quiet NaN is returned.

                          When ABS(X) > 6433.0, TAN(X) completely loses
                          significance.  See Appendix A for more details.

MPE/iX 5.0 Documentation