I'm an engineering undergraduate, and my university doesn't require me to take any math courses past the standard calculus sequence and differential equations. The field I am interested in entering in grad school is slightly math-intensive, to the point that it requires more math than what I have taken. At this time, I have two years left to graduate, and I'll be taking about 17-18 hours each semester until then, so it would be very difficult me to tack on an extra math course. I was considering simply officially auditing one, so that it appears on my transcript and so that I at least have some exposure to the subject.
My question is: will this have any positive benefits while I'm applying to graduate school? Or would the admissions committee assume that I didn't learn as much as someone who actually took the course, and take it with a grain of salt that I know the material?
On a related note: what about if the course I audited was on directly in my major? Would that be beneficial (if it were, say, a graduate-level course)?