## anonymous one year ago question answered

1. anonymous

This is a multiple choice question, so I can provide the choices if needed.

2. anonymous

you know how graph of cosx looks like?

3. anonymous

wavey

4. anonymous

right. and at x=0 it is equal 1

5. anonymous

here are my choices, maybe they will help.

6. anonymous

im with you so far

7. anonymous

from the graph of cosx you can see that it repeatedly goes from -1 through 0 to 1. sec x = 1/cosx so i think you can notice that when cosx=0 secx will have a problem. Right?

8. anonymous

Right!

9. anonymous

all the options are wavey and do this though

10. anonymous

what will sec(x) be equal to when cos(x)=0 ?

11. anonymous

0 as well? it can't be -0

12. anonymous

it can aproach 0 from negative side of y-axis or from positive side. There is no such a thing like -0

13. anonymous

what will sec(x) be equal to when cos(x)=0 ?

14. anonymous

alright so A and B as well as C and D both have the same shaped wave, so is it the outer lines in the corners we need to look at?

15. anonymous

cosx=1 at x=0. So A,B are not correct since there it equals 0 and not 1

16. anonymous

Well having it narrowed down helps, how do we determine which of C and D is the correct answer now?

17. anonymous

ask yourself this question: what will sec(x) be equal to when cos(x)=0 ?

18. anonymous

1?

19. anonymous

I think i'm just going with C

20. anonymous

thanks for the help

21. anonymous

what is 1/0=?

22. anonymous

you cannot divide by 0, can you?