Add news item and remove testing code

Author: jepler

Misc/NEWS.d/next/Library/2026-05-27-15-51-29.gh-issue-150534.3Nan6S.rst

@@ -0,0 +1,6 @@
+Added trigonometric functions that work in units of half turns, rather than
+radians. The new functions :func:`math.acospi`, :func:`math.asinpi`,
+:func:`math.atanpi`, and :func:`math.atan2pi` return half-turn angles. The
+new functions :func:`math.cospi`, :func:`math.sinpi`, and :func:`math.tanpi`
+take half-turn angle arguments. These functions are recommended by IEEE
+754-2019 and standardized in C23.

Modules/mathmodule.c

@@ -73,16 +73,6 @@ raised for division by zero and mod by zero.
 
 #include "clinic/mathmodule.c.h"
 
-// for testing; do not include in production version
-// this prevents the platform functions from ever being used.
-#undef HAVE_ACOSPI
-#undef HAVE_ASINPI
-#undef HAVE_ATANPI
-#undef HAVE_ATAN2PI
-#undef HAVE_COSPI
-#undef HAVE_SINPI
-#undef HAVE_TANPI
-
 /*[clinic input]
 module math
 [clinic start generated code]*/