> The need for and relationships between concepts in calculus, logarithms and trigonometry were a recurrent problem for me.

Oh my gosh, this was me growing up! I loved tinkering with electronics and programming, but I kept bumping against my lack of knowledge wrt more advanced math topics. I usually hacked around it, or more often just switched to a different project.

Now that I'm taking calculus, I feel like I always have a corresponding application for each topic we cover. It's very exciting!