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

    Question 1 a)

    Not sure what to do here, any help?

    Thanks
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    (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.
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    (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?
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    (Original post by james22)
    What can I do with the square of an infinite series though?
    You'll get something that looks like (\sum_{i=1}^{\infty}x_i)(\sum_{j  =1}^{\infty}x_j), rewrite it as \sum_{i,j=1}^{\infty} x_i x_j. 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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