.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
+.\"O .BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
+.BR "#define _GNU_SOURCE" " /* feature_test_macros(7) »²¾È */"
.B #include <math.h>
.sp
.BI "void sincos(double " x ", double *" sin ", double *" cos );
.SH ´ØÏ¢¹àÌÜ
.BR cos (3),
.BR sin (3),
-.BR tan (3),
-.BR feature_test_macros (7)
+.BR tan (3)