Question

What is the derivative of 2x/(x^2 + cosy) with respect to x?

Answer 1

Do you know the quotient rule?

Answer 2

g'(x)h(x) - g(x)h'(x)/[h(x)]^2 ?

Answer 3

Yep! Because you are taking the derivative with respect to x, cos(y)=0

Answer 4

So it ends up being ((x^2 + cosy)(2) - (2x)(2x))/(x^2 + cosy)^2 ?

Answer 5

Yep