anonymous
  • anonymous
Find the value of cos (-110) using the unit circle?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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triciaal
  • triciaal
what is the reference angle ? unit circle x = r cos theta and y = r sin theta angles are measured from the horizontal right in an anticlockwise direction
triciaal
  • triciaal
|dw:1447275315984:dw|
anonymous
  • anonymous
|dw:1447275464484:dw|

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anonymous
  • anonymous
@triciaal
triciaal
  • triciaal
how to you find angle (-110)?
triciaal
  • triciaal
|dw:1447275965936:dw|
triciaal
  • triciaal
|dw:1447276249459:dw|
anonymous
  • anonymous
wait, so what's the answer?
freckles
  • freckles
use that cos has period 360 cos(-110) = cos(-110+360) = cos(250) are you sure your question doesn't say like express it in terms of sin( ) or something else?
triciaal
  • triciaal
@freckles I was thinking more of similar figures, r = rt2 theta = 70 wouldn't that work?

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