15. If x=a Sin2t (I+Cos2t) and y=b Cos 2t (1-Cos2t) then find
dy/dx at =22/7*4

By the chain rule,

It looks like we're given

where a and b 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.

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