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For what numbers ∅ is f(∅) = tan ∅ not defined?
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For what numbers ∅ is f(∅) = tan ∅ not defined?

User The Fox
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f(\phi)=tan\phi\ is\ not\ de fined\ for\ \phi=(\pi)/(2)+k\pi\ where\ k\in\mathbb{Z}.
User Dnclem
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