marigirl
  • marigirl
Can you please explain.. integrate 2 cos^2(x)
Mathematics
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
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anonymous
  • anonymous
probs a good idea to use trig identities
anonymous
  • anonymous
\[\cos(2x)=2\cos ^{2}(x)-1\]
marigirl
  • marigirl
so then i have: 2 cos^2(x)=cos(2x)+1

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marigirl
  • marigirl
when i integrate that I get sin(2x)/2 + x....... the ans says sin(x)cos(x)+x
anonymous
  • anonymous
use trig identities for sin(2x)
anonymous
  • anonymous
sin(2x) = 2sin(x)cos(x)
marigirl
  • marigirl
thanks!
anonymous
  • anonymous
: )
anonymous
  • anonymous
http://www.purplemath.com/modules/idents.htm
anonymous
  • anonymous
probs a good idea to have a cheat sheet by your side when you do these problems
anonymous
  • anonymous
cheat sheet of trig identities...
marigirl
  • marigirl
even the cheat sheet is complicated :(
anonymous
  • anonymous
not if you know what you are looking for! if you find it hard to integrate something and its not your basic cosx sin(x) etc...then most likely its a trig identity you need to use to replace it
marigirl
  • marigirl
or i just need to do more problems! haha
anonymous
  • anonymous
yep, repitition and u will be a gun
marigirl
  • marigirl
thanks for that website link!
anonymous
  • anonymous
np : )

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