diff --git a/collects/typed-scheme/private/base-env.ss b/collects/typed-scheme/private/base-env.ss
index 6f4fad8a..7cf90e48 100644
--- a/collects/typed-scheme/private/base-env.ss
+++ b/collects/typed-scheme/private/base-env.ss
@@ -306,12 +306,19 @@
 [real-part (N . -> . N)]
 [imag-part (N . -> . N)]
 [magnitude (N . -> . N)]
-[angle (N . -> . N)]
-[numerator (N . -> . -Integer)]
+[angle     (N . -> . N)]
+[numerator   (N . -> . -Integer)]
 [denominator (N . -> . -Integer)]
+[rationalize (N N . -> . N)]
 [expt (cl->* (-Integer -Integer . -> . -Integer) (N N . -> . N))]
-[log (N . -> . N)]
-[exp (N . -> . N)]
+[log  (N . -> . N)]
+[exp  (N . -> . N)]
+[cos  (N . -> . N)]
+[sin  (N . -> . N)]
+[tan  (N . -> . N)]
+[acos (N . -> . N)]
+[asin (N . -> . N)]
+[atan (N . -> . N)]
 
 [arithmetic-shift (-Integer -Integer . -> . -Integer)]
 [bitwise-and (null N . ->* . N)]