anonymous
  • anonymous
If cos θ = 4/5, what is cos (- θ)?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
\[\cos (- \theta)=\cos(\theta)= 4/5\]\[\theta \]
anonymous
  • anonymous
yeah i know you switch it, but now do I just plug that in my calculator or leave it?
anonymous
  • anonymous
just for 4/5

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anonymous
  • anonymous
cosine is even function, f(-x) = f(x)
anonymous
  • anonymous
ohkay so it would be cos(- θ)= 4/5?
anonymous
  • anonymous
Try drawing the two triangles on a coordinate grid. |dw:1349313476943:dw|
anonymous
  • anonymous
ohkay, im not sure how that helps me?
anonymous
  • anonymous
Do you know what the definition of cosine is?
anonymous
  • anonymous
no
AravindG
  • AravindG
cos(-theta)=cos theta
anonymous
  • anonymous
so then its just 4/5
AravindG
  • AravindG
yep!!!
anonymous
  • anonymous
thanks!!

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