How to make an exception to the -use_fast_math directive

In an application, every trig operation can safely use the fast intrinsic functions, except a pair of sinf operations. Is there anyway I can use the use_fast_math preprocessor directive but mark these two instances as exceptions to that directive?
The reason i do not replace every other operation with the __ variate is that I want to keep the use_fast_math option off for debug builds and only have it active for release builds.