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1 files changed, 5 insertions, 1 deletions
diff --git a/man3/cos.3 b/man3/cos.3
index 8249531992..c68c2042ec 100644
--- a/man3/cos.3
+++ b/man3/cos.3
@@ -66,7 +66,11 @@ or
.SH DESCRIPTION
The
.BR cos ()
-function returns the cosine of \fIx\fP, where \fIx\fP is
+function returns the cosine of
+.IR x ,
+where
+.I x
+is
given in radians.
.SH RETURN VALUE
On success, these functions return the cosine of