Why tan 90 is Undefined C4 Communication and Basic Concept

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Tan (90- Ө) = Cot Ө and Cot (90- Ө) = Tan Ө

show that cos90=0, tan 90=undefined and sin90=1?

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tan 90° = infinity or undefined (Why & How?)

Is tan 90 undefined or infinity? - Quora

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Angles for which trig identities are undefined