Let f (x) = cosx be expanded into a power series of X + π / 6,

Let f (x) = cosx be expanded into a power series of X + π / 6,

（Cosx）2
=(1 + cos (2x)) / 2
Cos (2 ×) = 1 -! (2x) ^ 2 / 2 + (2x) ^ 4 / 4! - (2x) ^ 6 / 6 +
(cosx) 2 = 1 + (1 / 2) (-! (2 ×) ^ 2 / 2 + (2 ×) ^ 4 / 4 - (2 times) ^ 6 / 6 +.)!

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