anonymous
  • anonymous
Find the sin and cos of theta. (diagram)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
|dw:1328328468937:dw|
Mertsj
  • Mertsj
Remember that sin is side opposite/hypotenuse and cos = side adjacent/hypotenuse. \[\sin \theta = \frac{12}{13}\]
Mertsj
  • Mertsj
\[\cos \theta=\frac{-5}{13}\]

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anonymous
  • anonymous
theta doesn't equal 360 minus the angle between 5 and 13, just 180 minus that angle... is it still that simple?
Mertsj
  • Mertsj
So yes. After you find your reference angle, subtract it from 180 to get the angle measured counterclockwise from the positive x axis.
anonymous
  • anonymous
how do you find the reference angle?
dumbcow
  • dumbcow
depends on which quadrant you are in: Let A be the angle, R be reference angle Quad 1: R =A Quad 2: R = 180-A Quad 3: R = A-180 Quad 4: R = 360 -A

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