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Mathematics
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This is a multiple choice question, so I can provide the choices if needed.
you know how graph of cosx looks like?
wavey

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Other answers:

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

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