cos 2x = 1 - 4x
2
/2! + 16x
4
/4! -... + (-1)
n
(2x)
2n
/(2n)! + ... = 1 - 2x
2
+ 2x
4
/3 - ... + (-1)
n
(2x)
2n
/(2n)! + ...
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