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Please Show the Steps to Verify: tan(90º+Ø)=-cotØ

Mathematics
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Other answers:

what exactly you don get?
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ctg(x)=cos(x)/sin(x)=1/tg(x), since tg(x)=sin(x)/cos(x)
where does the tan(x) on top disappear to? because your answer said: 1/tan(x)=-cot(x)
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can I try?
I need all the help I can get :)
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that makes sense
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Yes? No?
Thanks that was more simple @Loser66 and thanks for your help as well @RaphaelFilgueiras
:)

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