In the solution to the problem following session 8, it reads
"We know that -1 is less than or equal to sin(x) which is less than or equal to 1."
I'm good with this, but then it reads:
"So it must be true that:"
-1/x is less than or equal to sin(x)/x which is less than or equal to 1/x.
I don't understand (algebraically) this could be true of all values of x. Can someone please explain?

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