If we define the sine and cosine functions by their Maclaurin expansions, how do we prove they are periodic with period $2\pi$?
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3http://math.stackexchange.com/questions/63102/how-to-prove-periodicity-of-sinx-or-cosx-starting-from-the-taylor-seri and http://math.stackexchange.com/questions/610217/parity-through-series-expansion – lab bhattacharjee Jan 31 '14 at 08:53
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Why the negative vote? – copper.hat Jan 31 '14 at 09:12