If sin x/x = 863/864. find x using expansion of sin x in terms of x

If sin x/x = 863/864, find x using expansion of sin x in terms of x It appears in college math book. I need a detailed step by step explanation please
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??????????????? iz zat spozed tu be [sine(x)] /x ?????????????... sine(x)=x -x^3/3! +x^5/5! -x^7/7!+-... divide bi x & yu get 1 -x^2/6 +x^4/5!-+....
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