I have been having more then some trouble proving some identities. Mostly after some time I have found that I've been missing something very simple and I'm sure it's the same with these, but I'd appreciate some help.
The questions I'm working on are in a section dealing with only the following four identities:
I can't do either of these
A hint at how to approach these would be very welcome.
Thank you Plato,
The difference of two squares. I should have seen that and will try it, thank you.
For the second, I have been trying to do these just using identities. Do I need, in general, to be thinking about manipulating in the way you have shown? I thought I could only use identities.
Thank you all for your posts they have all been really helpful and I'm very grateful. I'm sorry for not replying to all of them individually, but I'm experiencing technical difficulties. I will try using the methods you have shown me when proving the rest of the identities I'm working on.