Fhijjuuhj. Hejdjjd. Hehdhe hejejd. Ushehdjr jdjdj dinr jfnrj
Can you tell me what do you mean exactly by menu of 8, so i can help you.
By the chain rule,

It looks like we're given

where <em>a</em> and <em>b</em> are presumably constant.
Recall that


so that

Then we have




where the last reduction follows from dividing through everything by
and simplifying.
I'm not sure at which point you're supposed to evaluate the derivative (22/7*4, as in 88/7? or something else?), so I'll leave that to you.