not quite understanding the MATH function

[Rhatidbwoy]

I am still in the learning phase. Just complete one program and moving on to hte other. The second program is based around plenty of math. I have attached portion of my program showing the type of math that I trying to do. With it I am getting error messages in my complex math based around basic functions. I even went into the extent of breaking it down to different levels and still got error. Is there anything that anyone could hinder for a problem solving. That is in the case of me not understanding what I am doing wrong.