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sin(x) = x - x^3/3! + x^5/5! - x^7/7! + . sin(x)/x = 1- x^2/3! + x^4/5! - x^6/7!+. sin(x)/x =Σ_ (n=0)^(∞) (-1)^n x^2n / (2n+1)!
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