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anonymous

  • one year ago

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  1. anonymous
    • one year ago
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    Angle \[\theta \] is in quadrant II and \[\sin \theta = 5/13\]. Determine an exact value for \[\cos2 \theta \]

  2. arindameducationusc
    • one year ago
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    easy....

  3. arindameducationusc
    • one year ago
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    use cos2theta=1-2sin^2theta

  4. arindameducationusc
    • one year ago
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    so, 1-2(5/13)^2

  5. arindameducationusc
    • one year ago
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    I hope you can get the answer now

  6. anonymous
    • one year ago
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    =p umm thanks?

  7. arindameducationusc
    • one year ago
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    My pleasure.... :)

  8. anonymous
    • one year ago
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    o wait isn't it supposed to be 1-2(12/13)^2?

  9. anonymous
    • one year ago
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    and then you get a final answer of 119/169

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