Do any of you know for sure if you can multiply an undefined number k/0 by 0 to get k or anything else? In other words can you do anything to an undefined number?
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Do any of you know for sure if you can multiply an undefined number k/0 by 0 to get k or anything else? In other words can you do anything to an undefined number?
NO
As I said, you can only declare it undefined. ;)
show you a case where what you said DOES work but it should never attempted (reader's discretion advised).
tan(90+x)
=(tan90+tanx)/(1-tan90tanx)
=(1/0+tanx)/(1-tanx/0)
multiply top and bottom by 0
=(1+0)/(0-tanx)
=-1/tanx
=-cotx
which is right
you should actually consider splitting tan(90+x) into sin(90+x)/cos(90+x) to get the desired -cotx instead of operating on undefined values.