How are some of the values for cot2x=0 2x= 90, 270?
I understand that cotx= 1/tanx but I didnt know what to do from there as you can't do 1/0.
Any help would be great
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also if tan2x=1/0 then right hand side is not defined.
and the fact is that tan2x is undefined for odd values of pi/2
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