Thread: basic question about designation

I am learning calculus at home during my summer break.In my current lesson, here's the problem:Let 2x squared y + y squared = cos x.Find dy/dx.The solution is dy/dx = -sinx -4xy/2x squared + 2yThe intermediate steps:2x^2 dy/dx + y(4x) + 2y dy/dx = -sin xdy/dx(2x^2 + 2y)= -sin x - 4xyWhy is there dy/dx only for 2x squared and 2y and not -sin x and y(4x)?Any light you could shed on this would be greatly appreciated.Carrie

Hello! Please visit this thread to learn how to write posts using LaTeX: http://www.mathhelpforum.com/math-he...-tutorial.html

As your post is at the moment, it's very hard to figure out what the question is.

Yes, LaTeX is very fun to use. I think you'll like it.

The reason we don't get a factor of is that the Product Rule states



Here, and . Thus, we have

Yes, I see. Thanks for your time, and I"ll check the formatting rules for future use. Please forgive me.
Carrie