I know that $\displaystyle -1\le \sin x\le 1$.

I also know that it is okay to write $\displaystyle -2<\sin x<2$.

But is it okay to write $\displaystyle -2\le \sin x\le 2$, although the equalities are never attained?

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- Jan 16th 2012, 03:23 AMalexmahoneA simple query regarding inequalities
I know that $\displaystyle -1\le \sin x\le 1$.

I also know that it is okay to write $\displaystyle -2<\sin x<2$.

But is it okay to write $\displaystyle -2\le \sin x\le 2$, although the equalities are never attained? - Jan 16th 2012, 03:41 AMTKHunnyRe: A simple query regarding inequalities
It is typically bad form to include Domain just for fun, but it sometimes serves a purpose.

$\displaystyle 0 \le 1$

It is a matter of validity, not a matter of "okay". Is it valid? Feel free to write it any way you like if it serves some purpose.