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softballislove3 Group Title

Find cos θ if sin θ = -5/13 and tan θ > 0.

  • 2 years ago
  • 2 years ago

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  1. myininaya Group Title
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    If sine is negative and tangent is positive, then cosine is ____?____ tangent=sine/cosine=negative/cosine=positive =>cosine is ___?____

    • 2 years ago
  2. softballislove3 Group Title
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    positive?

    • 2 years ago
  3. myininaya Group Title
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    So negative/positive is positive No...

    • 2 years ago
  4. softballislove3 Group Title
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    no its negative

    • 2 years ago
  5. myininaya Group Title
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    Right. You want tangent to be positive not negative

    • 2 years ago
  6. softballislove3 Group Title
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    positive

    • 2 years ago
  7. myininaya Group Title
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    So you need cosine to be negative in order for tangent to be positive since sine is negative.

    • 2 years ago
  8. myininaya Group Title
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    So we are in the (-,-) quadrant.

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  9. softballislove3 Group Title
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    yea

    • 2 years ago
  10. softballislove3 Group Title
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    correct

    • 2 years ago
  11. myininaya Group Title
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    |dw:1351269639105:dw| \[\sin( \theta)=-5/13 \text{ is given to you} \]

    • 2 years ago
  12. softballislove3 Group Title
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    so then use pythagorean theorem to fine cosine

    • 2 years ago
  13. myininaya Group Title
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    Find the other side using the Pythagorean thm.

    • 2 years ago
  14. softballislove3 Group Title
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    which would end up being -12/13

    • 2 years ago
  15. myininaya Group Title
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    the other side is 12 is what you are saying and no i thought you were looking for cosine...

    • 2 years ago
  16. myininaya Group Title
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    oops I labeled the triangle wrong a little bit.

    • 2 years ago
  17. softballislove3 Group Title
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    i am

    • 2 years ago
  18. myininaya Group Title
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    |dw:1351270002298:dw|

    • 2 years ago
  19. myininaya Group Title
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    And you will be correct. :)

    • 2 years ago
  20. softballislove3 Group Title
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    |dw:1351270017306:dw|

    • 2 years ago
  21. softballislove3 Group Title
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    yay

    • 2 years ago
  22. softballislove3 Group Title
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    thank you!!!!

    • 2 years ago
  23. myininaya Group Title
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    Right.

    • 2 years ago
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