Showing $max(\frac{sin(x)}{x})=1$ is straight forward using l'hopital's rule. Is there another way to evaluate without using l'hopital's rule

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    It is not straightforward, it is circular. – DanielC Sep 18 at 22:01
  • Do you mean Sup(sin x/x)? – gimusi Sep 18 at 22:03
  • It's pretty easy using the Taylor series, but there is some sense it which is, as DanielC calls l'Hopital's rule, circular. – Acccumulation Sep 18 at 22:19


To prove that $\sup\left(\frac{\sin x}x\right)=1$ we can proceed showing that

  • $\frac{\sin x}x$ is even and not defined at $x=0$ then we can consider $x>0$
  • $\lim_{x\to 0} \frac{\sin x}x=1$
  • $g(x)=x-\sin x >0$ for $x>0$

Refer to the related

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