The cRIO runs JavaME, which is a subset of JavaSE 1.3, so even looking at the JavaSE v1.3 docs isn't sufficient.
There are additional math functions that aren't in the java ME spec that are implemented in
com.sun.squawk.util.MathUtils. This is in addition to the required JavaME math functions in
java.lang.Math
What functions are you looking for?