anonymous
  • anonymous
Find the point on the terminal side of θ =-3 pi/4 that has an x coordinate of -1.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Kash_TheSmartGuy
  • Kash_TheSmartGuy
http://www.algebra.com/algebra/homework/Coordinate-system/Coordinate-system.faq.question.375721.html - the same questions answer and tutorial! @mathway
Kash_TheSmartGuy
  • Kash_TheSmartGuy
no, but it's a tutorial. Plus, I was suspended for giving the answer to the question. So, this is just an example to a similar question.
anonymous
  • anonymous
I don't want you to give me the answer. @Kash_TheSmartGuy I just want to know the steps. :)

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More answers

anonymous
  • anonymous
|dw:1436055318688:dw|
anonymous
  • anonymous
the reference angle for -3pi/4 is pi/4. pi/4 has the same sine and cosine. angles for which pi/4 is the reference angle will then have sines and cosines that are either equal or opposites depending on the quadrant. make sense so far?
ybarrap
  • ybarrap
|dw:1436055520735:dw|
anonymous
  • anonymous
yes.
anonymous
  • anonymous
Does that mean that the x and y coordinates are equal?
anonymous
  • anonymous
yes
anonymous
  • anonymous
So y will -1 as well since it is in quadrant 3, (-x,-y).
anonymous
  • anonymous
that's right
anonymous
  • anonymous
That's it? :)
anonymous
  • anonymous
yep
anonymous
  • anonymous
Oh and it's actually a 45-45-90 reference angle, correct?
anonymous
  • anonymous
yes it is
anonymous
  • anonymous
And that explains why x and y are the same. :)
anonymous
  • anonymous
Thank you @peachpi !
anonymous
  • anonymous
you're welcome

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