anonymous
  • anonymous
Help plsss
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Angle \[\theta \] is in quadrant II and \[\sin \theta = 5/13\]. Determine an exact value for \[\cos2 \theta \]
arindameducationusc
  • arindameducationusc
easy....
arindameducationusc
  • arindameducationusc
use cos2theta=1-2sin^2theta

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arindameducationusc
  • arindameducationusc
so, 1-2(5/13)^2
arindameducationusc
  • arindameducationusc
I hope you can get the answer now
anonymous
  • anonymous
=p umm thanks?
arindameducationusc
  • arindameducationusc
My pleasure.... :)
anonymous
  • anonymous
o wait isn't it supposed to be 1-2(12/13)^2?
anonymous
  • anonymous
and then you get a final answer of 119/169

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