i have this
i set
differentiating z w.r.t , i have
substituting
i recall that
i tend to be confuse from here onward, pls help!
Now:
By plugging into , and we get:
And that's it. That's the answer. If you differentiate the new found answer with CAS(like maple) you'll get what you started with which is the given integral in the question. Hope this helps.