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diff --git a/openpower/transcendentals/discussion.mdwn b/openpower/transcendentals/discussion.mdwn
index f8dfa2434e1ffcf76a173782a403537d27f0504f..b4c75abd4fc41d1dfdb87b21422783d07cc69c7c 100644 (file)
--- a/openpower/transcendentals/discussion.mdwn
+++ b/openpower/transcendentals/discussion.mdwn
@@ -4,6 +4,7 @@
 * <https://www.khronos.org/registry/spir-v/specs/unified1/OpenCL.ExtendedInstructionSet.100.html>
 * Discussion: <http://lists.libre-riscv.org/pipermail/libre-riscv-dev/2019-August/002342.html>
 * [[power_trans_ops]] for opcode listing.
+* https://mathr.co.uk/blog/2015-04-21_approximating_cosine.html
 
 TODO: