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**derivative of: y=arctan(4/x)!!!**

This seems like it should be a very SIMPLE problem, but it has been bugging me for about 2 hours straight now, and I can't figure it out! Would really appreciate some quick help...

This is what I've done so far:

y'= -4/x^2 / (16/x^2 +1)

I dont know if this is the right answer??? And I am having problems simplifying this any further. Please help :P