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Assume that x is any real number, Prove that if 1/2 < sinx < 3/4, then 4x <= x^2 + 8
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I'm confused when looking at the domain of x since sin repeats every 2pi and there's more than one interval.
@southpaw can you refer me the topic or the chapter name?
Consider one period of the sine function: |dw:1445105011181:dw|
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