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# Series Question watch

1. https://www.maths.ox.ac.uk/system/fi...aperD_2012.pdf

Question 1 a)

Not sure what to do here, any help?

Thanks
2. (Original post by james22)
https://www.maths.ox.ac.uk/system/fi...aperD_2012.pdf

Question 1 a)

Not sure what to do here, any help?

Thanks
Square both sides of the first equation, and use the given identities to evaluate the right-hand side.
3. (Original post by Mark13)
Square both sides of the first equation, and use the given identities to evaluate the right-hand side.
What can I do with the square of an infinite series though?
4. (Original post by james22)
What can I do with the square of an infinite series though?
You'll get something that looks like , rewrite it as . You can prove that this is true using analysis, but as this is an applied maths paper I don't think you'd be expected to do that.

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