anonymous
  • anonymous
Find the point on the terminal side of θ = -(3pi/4) that has an x coordinate of -1. Show your work for full credit.
Trigonometry
chestercat
  • chestercat
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chestercat
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anonymous
  • anonymous
Great question... The best approach is to draw a picture...
anonymous
  • anonymous
|dw:1364161840915:dw|
anonymous
  • anonymous
Alright, so I'm looking for the y-coordinate I assume?

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NoelGreco
  • NoelGreco
That's positive 3pi/4
anonymous
  • anonymous
You're right... let's make it negative 3pi/4
anonymous
  • anonymous
|dw:1364162032750:dw|
anonymous
  • anonymous
Since the angle is pi/4 --- or 45 degrees, we have a 45-45-90 right triangle...
anonymous
  • anonymous
|dw:1364162159200:dw|
anonymous
  • anonymous
So, from the graph, you can see the y-coordinate...
anonymous
  • anonymous
square root of 2
anonymous
  • anonymous
?
anonymous
  • anonymous
Oh wow nevermind it's -1

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