AonZ
  • AonZ
Hard trig question. Please Please help! if θ is an acute angle and cos θ = 4/5 . use the result cos^2 θ = (1 + cos2x) / 2 . Find the exact value of cos (θ/2)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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AonZ
  • AonZ
@phi @primeralph @ganeshie8
primeralph
  • primeralph
|dw:1368828851468:dw|
primeralph
  • primeralph
|dw:1368828916634:dw|

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primeralph
  • primeralph
|dw:1368828952238:dw|
AonZ
  • AonZ
isnt cosA = 4/5? not cos2A?
primeralph
  • primeralph
no, I changed theta = 2A, so costheta = cos2A
AonZ
  • AonZ
oh :P didnt know you could do that! Thanks so much!!!
primeralph
  • primeralph
you can.

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