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livethelifewelove

If cos θ = 4/5, what is cos (- θ)?

  • one year ago
  • one year ago

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  1. ipm1988
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    \[\cos (- \theta)=\cos(\theta)= 4/5\]\[\theta \]

    • one year ago
  2. livethelifewelove
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    yeah i know you switch it, but now do I just plug that in my calculator or leave it?

    • one year ago
  3. ipm1988
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    just for 4/5

    • one year ago
  4. CliffSedge
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    cosine is even function, f(-x) = f(x)

    • one year ago
  5. livethelifewelove
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    ohkay so it would be cos(- θ)= 4/5?

    • one year ago
  6. CliffSedge
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    Try drawing the two triangles on a coordinate grid. |dw:1349313476943:dw|

    • one year ago
  7. livethelifewelove
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    ohkay, im not sure how that helps me?

    • one year ago
  8. CliffSedge
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    Do you know what the definition of cosine is?

    • one year ago
  9. livethelifewelove
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    no

    • one year ago
  10. AravindG
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    cos(-theta)=cos theta

    • one year ago
  11. livethelifewelove
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    so then its just 4/5

    • one year ago
  12. AravindG
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    yep!!!

    • one year ago
  13. livethelifewelove
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    thanks!!

    • one year ago
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