diff --git a/src/pointwise.py b/src/pointwise.py
index d32970329a6d671897f9f3e4ed8993b8ee14d4f7..59254e96c6e839e115637ad7a4950dc4a0890697 100644
--- a/src/pointwise.py
+++ b/src/pointwise.py
@@ -150,8 +150,6 @@ ptw_dict = {
     "clip": (np.clip, _clip_helper),
     "softplus": (softplus, _softplus_helper),
     "exponentiate": (exponentiate, _exponentiate_helper),
-    "arcsin": (np.arcsin, lambda v: (np.arcsin(v), 1./np.sqrt(1.-v**2))),
-    "arccos": (np.arccos, lambda v: (np.arccos(v), -1./np.sqrt(1.-v**2))),
     "arctan": (np.arctan, lambda v: (np.arctan(v), 1./(1.+v**2))),
     "unitstep": (lambda v: _step_helper(v, False), lambda v: _step_helper(v, True))
     }