this is the function that i must differentiate: i need dy/dx

http://webwork.math.ttu.edu/webwork2...02128fd941.png

here is my answer:

http://webwork.math.ttu.edu/webwork2...683ba36c01.png

i believe my answer is correct, and the person who graded it is wrong, and i dont have the "actual" answer. thanks in advance.

i have solved it, i just needed to switch the top and bottom, thanks.