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What is the domain of cotangent?

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1 Answer

May 25, 2015

#cot theta = cos theta / sin theta#

is well defined provided #sin theta != 0#

#sin theta = 0# for #theta = n pi# for all #n in ZZ#.

So the domain of #cot# is #RR# \ #{ n pi : n in ZZ }#

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