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First of all, it's definitely safe to say that space is one of the play's key themes. We see it in lots of different ways - but in the broadest sense, you should notice how the play moves from a wide open...

Okay so consider (2 + x)^-1, we can only do the expansion we know if the bracket starts with a 1, to fix this we can factor a 2 out of the bracket so that it becomes (2(1 + x/2))^-1. Then by our rules of ...