I'm guessing this is a trigonometric expansion, just not sure which one.
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Notice how the coefficients match those of ? Now think a little and try to make the necessary adjustments to the powers ...
Is the expansion of cos(x) not ? (sorry didn't realise you'd edited) but yeah I was thinking it had something to do with cos, just can't figure it out. Also I have another expansion I'm interested in... this has something to do with sin hasn't it?
would it be fair to say my expansion is ?
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