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series (sin (x),x,pi /2)
solve(1 - x**2/2 + x**4/24 + O(x**6), x)
diff(1 - x**2/2 + x**4/24 + O(x**6), x)
series(1 - x**2/2 + x**4/24 + O(x**6), x, 0, 10)
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