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.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
|dw:1371959254076:dw|So to find the coordinate, we must find it's y-value. We have the x-value of the side lying on the x-axis and an angle that is made with the x-axis of pi/4, but how many units down do we go down, or what is the y-value? From SOHCAHTOA,, which should we use that deals with the y-value and uses the x-value?
anonymous
  • anonymous
@genius12 I know it's not tan that we use so Im thinking it's sine
anonymous
  • anonymous
@erickkoro, It is in-fact tan. What made you think it wasn't tan lol.

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anonymous
  • anonymous
@genius12 because i thought we needed the hypotenuse. .
anonymous
  • anonymous
tan(x) = opposite/adjacent. We have adjacent side, we need the opposite side which we can solve for. Remember the coordinate (x, y) has two parts: the x-value and y-value. We know the x-value, so to find the y-value, we would have to use tangent.
anonymous
  • anonymous
@genius12 Alright, I'm with you so far .
anonymous
  • anonymous
|dw:1371959952740:dw|
anonymous
  • anonymous
@erickkoro You with me?
anonymous
  • anonymous
Can you solve for y?
anonymous
  • anonymous
@genius12 I see how you got everything but I would of never been able to come up with it by myself, & is y=-1 ?
anonymous
  • anonymous
That is right.
anonymous
  • anonymous
@erickkoro, you see, once you do enough problems and get familiar with the concepts, you will automatically recognise the situation and what needs to be done. For now I suggest you strengthen your trig skills by understanding SOHCAHTOA, and do similar problems. Also look at the unit circle and the common trig ratios.
anonymous
  • anonymous
@genius12 so is -1 the point on the terminal side of θ = -3pi/4 ?
anonymous
  • anonymous
@genius12 ?
anonymous
  • anonymous
@erickkbro sorry was afk. that is correct, the point joining the terminal side of the angle has an x-coordinate of -1.

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