That's the question I can't do. It would be so much easier if it was a cos squared! I think I have to use a substitution but i'm not quite sure what it should be.
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Originally Posted by Showcase_22 That's the question I can't do. It would be so much easier if it was a cos squared! I think I have to use a substitution but i'm not quite sure what it should be. Multiply by Can you do it now?
Or, you can rewrite as . I'll leave it to you to figure out why they're equivalent.
I can do it, and I have solved it. I tried deriving the second identity myself but I couldn't figure that part out. can you show me how it's done?
oh!! I don't know what I was doing. It's just a simple double angle formulae. That's rather useful.
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