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先使用泰勒公式得到:sinx=x- x^3 /3!+ x^5 /5!- x^7 /7!+ x^9 /9!…arctan x = x - x^3 / 3 + x^5 / 5 - x^7 / 7 - x^9 / 9…故sinx - arctan x=(x- x^3 /3!+ x^5 /5!- x^7 /7!+ x^9 /9!…)-(x - x^3 / 3 + x^…
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