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cosx = 1 - x^2 / 2 + x^4 / 24 + O(x^6)
e^(x^2) = 1 + x^2 + x^4 / 2 + O(x^6)
cosx - e^(x^2) = - (3/2) x^2 - (11/24) x^4 + O(x^6)
e^(x^2) = 1 + x^2 + x^4 / 2 + O(x^6)
cosx - e^(x^2) = - (3/2) x^2 - (11/24) x^4 + O(x^6)
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