Ok on this one I know you use the chain rule? The formula for csc is -cscu cotu du/dx so should it go somthing like
------>y'= -csc(x^2) cot(x^2) (2x) ???
can I rewrite it to
-----> f(x)= (tan x)^3
f '(x)= 3(sec^2 x)^2 (1)
Any help would be great.