How do you verify #tan y cot y = 1#?

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How do you verify #tan y cot y = 1#?

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Answer 1 · 2018-06-18T05:23:45

#tan y=sin y /cos y#
#cot y=cos y /sin y=1/tan y#
#dom(cot(y))={y|y!=(2n+1)/2 pi#(n=integer number)#}#
#dom(cot(y))={y|y!=n pi#(n=integer number)#}#
#y!=n/2 pi#(n=integer number)
#tan y * cot y = 1#

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How do you verify #tan y cot y = 1#?

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