amurciano2
  • amurciano2
How would you dinghies question. I have the work, but I can't find a mistake.
AP Math
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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amurciano2
  • amurciano2
Here is my work.
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anonymous
  • anonymous
|dw:1441657409641:dw|
anonymous
  • anonymous
You must use cos (2t) = 1-2sin^2 t so that sin^2 t = (1/2) - (cos (2t))/2 to plug in the integral. One more thing: if you let x = 2 sin t, then t = arcsin(x/2) , the limits change also when x = 0 , t = ...., x =1 , t=.... Replace all to work.

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anonymous
  • anonymous
Don't forget, if x from 0 to 1, t < pi/2
amurciano2
  • amurciano2
We're did you get the cos(2t) from?
anonymous
  • anonymous
That is an identity
anonymous
  • anonymous
http://www.purplemath.com/modules/idents.htm at "double angles identity"
amurciano2
  • amurciano2
Where is the double identity in the work?
amurciano2
  • amurciano2
I see it. Thank you!!!!
amurciano2
  • amurciano2
I retried it. Do you still find a mistake?
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amurciano2
  • amurciano2
I found one mistake. The answer is till not right though. :(
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