Log Message:
-----------
Document that trig functions accept/return values in radians.
Modified Files:
--------------
pgsql/doc/src/sgml:
func.sgml (r1.507 -> r1.508)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml?r1=1.507&r2=1.508)