anonymous
  • anonymous
Solve the equation in the specified interval Secx=-3 -pi
Mathematics
schrodinger
  • schrodinger
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misty1212
  • misty1212
HI!!
misty1212
  • misty1212
start with \[\cos(x)=-\frac{1}{3}\]
misty1212
  • misty1212
then comes some difficulty

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anonymous
  • anonymous
Hey! Yes I started with that
misty1212
  • misty1212
so now you are stuck since you don't know the answer to that
anonymous
  • anonymous
Basically I'm stuck in this step
misty1212
  • misty1212
you need to use a calculator to find \[\cos^{-1}(-\frac{1}{3})\]
misty1212
  • misty1212
that will only give you one answer in quadrant 2 though
anonymous
  • anonymous
Ok I got it
misty1212
  • misty1212
|dw:1440123708272:dw|
misty1212
  • misty1212
you want the other one, it is the negative of the first one
misty1212
  • misty1212
|dw:1440123787810:dw|
anonymous
  • anonymous
So first one is 1.91
misty1212
  • misty1212
hmm let me check
misty1212
  • misty1212
http://www.wolframalpha.com/input/?i=arccos%28-1%2F3%29 yeah looks good
anonymous
  • anonymous
Ok so how do I get the opposite
misty1212
  • misty1212
it is the negative of the first one
anonymous
  • anonymous
-1.91?
misty1212
  • misty1212
|dw:1440124243706:dw|
misty1212
  • misty1212
scuse the bad picture yeah what you wrote
anonymous
  • anonymous
Ok so how would you write to make it look like pi/2

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