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quasar987

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## Main Question or Discussion Point

How can I show the function [itex]f:]-\frac{\pi}{2},\frac{\pi}{2}[ \rightarrow R[/itex] defined by [itex]f(x)=tan(x)[/itex] is surjective?

If the domain was a closed interval I could use the intermediate value theorem, but now?

Thank you.

If the domain was a closed interval I could use the intermediate value theorem, but now?

Thank you.