How should I have solved this?

So just got my exam and there was this question on it that I just didn't know where to start, wondered if any of you could explain to me how it should have been done.

Had to show that could be written as

I'm pretty sure that was the question, if its not possible then the + is probably a -after the first fraction.

Also the next part was to solve and all my friends got 2 answers and I got 4, does that sound right?

Only identies we can use in this exam are

and all the 1 overs for tan sin and cos.

Thanks!