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livethelifewelove Group Title

If cos θ = 4/5, what is cos (- θ)?

  • 2 years ago
  • 2 years ago

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

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

    • 2 years ago
  3. ipm1988 Group Title
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    just for 4/5

    • 2 years ago
  4. CliffSedge Group Title
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    cosine is even function, f(-x) = f(x)

    • 2 years ago
  5. livethelifewelove Group Title
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    ohkay so it would be cos(- θ)= 4/5?

    • 2 years ago
  6. CliffSedge Group Title
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    Try drawing the two triangles on a coordinate grid. |dw:1349313476943:dw|

    • 2 years ago
  7. livethelifewelove Group Title
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    ohkay, im not sure how that helps me?

    • 2 years ago
  8. CliffSedge Group Title
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    Do you know what the definition of cosine is?

    • 2 years ago
  9. livethelifewelove Group Title
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    no

    • 2 years ago
  10. AravindG Group Title
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    cos(-theta)=cos theta

    • 2 years ago
  11. livethelifewelove Group Title
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    so then its just 4/5

    • 2 years ago
  12. AravindG Group Title
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    yep!!!

    • 2 years ago
  13. livethelifewelove Group Title
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    thanks!!

    • 2 years ago
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