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## anonymous one year ago how would i state the domain for this: f(x) = - 2 cot 3x

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1. anonymous

is that a 3x or cot^3 (x)

2. anonymous

3x

3. rock_mit182

let's say U = 3x. Y = -2 cot (U). Do you remember the identity of cot (U) =

4. rock_mit182

?

5. rock_mit182

@kirarittgers

6. anonymous

no i dont know what that means

7. rock_mit182

cot (U) = $\frac{ \cos (u) }{ \sin(u) }$

8. anonymous

oh yeah i knew that

9. anonymous

but what do i do with that

10. rock_mit182

;) now, to find out your domain we have to avoid $\frac{ 0 }{ 0 }$

11. rock_mit182

cause $\frac{ 0 }{ 0 }$ doesn't make sense in math is jut not allowed

12. anonymous

no shh i really knew that i just didnt know what you were asking and i still know that what i dont understan is how to state it

13. rock_mit182

so we need to avoid those values tha makes: $\frac{ \cos u }{ \sin u }$

14. anonymous

he gave you the identity, now he's trying to avoid sin U where sin U = 0 so that the function is undefined

15. rock_mit182

0 over o

16. anonymous

like i know it cant equal pi/3 or any other vertical asymtope but i dont know how to write that

17. anonymous

i know the values it cant equal though i need to know how to write it

18. rock_mit182

well it is getting harder to explain LOL

19. rock_mit182

Do you have how to graph that function ?

20. anonymous

how bout you just tell me the answer lol because i already know everything i dont need explaining i need to know how its supposed to be writen

21. anonymous

yes i do

22. anonymous

ive already graphed it

23. anonymous

do you understand what im asking like you know how you write it in parenthesis i need to know how im supposed to put the values in there

24. rock_mit182

of course i do , but what i cannot do, here, is just give ramdom answers

25. anonymous

its not random but oh well

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