vera_ewing
  • vera_ewing
Math question
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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vera_ewing
  • vera_ewing
anonymous
  • anonymous
definitely not C
anonymous
  • anonymous
if you do not have this memorized, do the same as before draw a triangle, find the missing side

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just_one_last_goodbye
  • just_one_last_goodbye
Would love to help but this type of problems are way above my knowledge xD good luck but you got pros that are helping c;' @satellite73 and @phi
anonymous
  • anonymous
what you need is a good unit circle cheat sheet
phi
  • phi
First step, identify the "line" that represents pi radians (or 180 degrees) ditto for 3pi/2 (270 degrees)
vera_ewing
  • vera_ewing
Well I know tanθ = (sqrt)3 , so how do I find cosθ using the triangle?
anonymous
  • anonymous
look in quadrant 3 to see where the second coordinate is \(-\frac{\sqrt{3}}{2}\)
anonymous
  • anonymous
you will see that the first coordinate is \(-\frac{1}{2}\) , that is the cosine
vera_ewing
  • vera_ewing
Wait wouldn't it be 1/2 not -1/2 ? Since it's in Quadrant 3?
anonymous
  • anonymous
you will also see that the angle is \(\frac{4\pi}{3}\) although you were not asked for that
anonymous
  • anonymous
no you are below the x axis in quadrant 3, so the first coordinate is negative, as is the second
phi
  • phi
|dw:1436191312914:dw|
vera_ewing
  • vera_ewing
Ohhh okay that makes so much more sense! Thank you :)
anonymous
  • anonymous
just like ordinary graph paper left is negative in the x, down is negative in the y
phi
  • phi
always put in a triangle in the correct quadrant. label the hypotenuse length 1 if they give you the sin, that is the y value if they give you the cos, that is the x value use pythagoras to find the unknown side. or , memorize the angles (painful, but doable)

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