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[ If 0ltxlt(pi)/(2) then 1) (2)/(pi)gt(...

[ If `0ltxlt(pi)/(2)` then 1) `(2)/(pi)gt(sin x)/(x) ` (2)`(pi)lt(sin x)/(x)` 3) `(sin x)/(x)gt1`, 4) `2lt(sin x)/(x)`

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