anonymous
  • anonymous
I need explanation...
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
|dw:1439109817446:dw|
hartnn
  • hartnn
know the double angle formula? cos 2x = ... ?
hartnn
  • hartnn
in terms of cos^2 x

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anonymous
  • anonymous
No i dont
hartnn
  • hartnn
ok, its good to know all variations of cos 2x formula I will write the 3 most important ones for you \(\Large \cos 2x = \cos^2 x - \sin^2 x\) \(\Large \cos 2x = 2\cos^2 x - 1\) \(\Large \cos 2x = 1-2\sin^2 x \)
hartnn
  • hartnn
we need to use the 2nd one for our problem try to get expression for cos^2 x from it
anonymous
  • anonymous
oh alright we are allowed to have a formula page. It says cos^2 x =1+cos2/2
hartnn
  • hartnn
exactly, that you'll get from the 2nd formula, just plug that into your integral!
anonymous
  • anonymous
|dw:1439110177783:dw|
anonymous
  • anonymous
Alright this wasnt so bad! Thank you :)
hartnn
  • hartnn
welcome ^_^
hartnn
  • hartnn
|dw:1439110246947:dw|
anonymous
  • anonymous
thanks cant forget the c.

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