code: public static <A extends Number & Comparable<?>> NumberExpression<Double> radians(Expression<A> num) {
          return Expressions.numberOperation(Double.class, Ops.MathOps.RAD, num);
      }
docs: Create a {@code rad(num)} expression
  
  <p>Converts degrees to radians</p>
  
  @param num numeric expression
  @return rad(num)