anonymous
  • anonymous
question answered
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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anonymous
  • anonymous
This is a multiple choice question, so I can provide the choices if needed.
anonymous
  • anonymous
you know how graph of cosx looks like?
anonymous
  • anonymous
wavey

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anonymous
  • anonymous
right. and at x=0 it is equal 1
anonymous
  • anonymous
here are my choices, maybe they will help.
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anonymous
  • anonymous
im with you so far
anonymous
  • 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?
anonymous
  • anonymous
Right!
anonymous
  • anonymous
all the options are wavey and do this though
anonymous
  • anonymous
what will sec(x) be equal to when cos(x)=0 ?
anonymous
  • anonymous
0 as well? it can't be -0
anonymous
  • anonymous
it can aproach 0 from negative side of y-axis or from positive side. There is no such a thing like -0
anonymous
  • anonymous
what will sec(x) be equal to when cos(x)=0 ?
anonymous
  • 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?
anonymous
  • anonymous
cosx=1 at x=0. So A,B are not correct since there it equals 0 and not 1
anonymous
  • anonymous
Well having it narrowed down helps, how do we determine which of C and D is the correct answer now?
anonymous
  • anonymous
ask yourself this question: what will sec(x) be equal to when cos(x)=0 ?
anonymous
  • anonymous
1?
anonymous
  • anonymous
I think i'm just going with C
anonymous
  • anonymous
thanks for the help
anonymous
  • anonymous
what is 1/0=?
anonymous
  • anonymous
you cannot divide by 0, can you?

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