integral of cos(2x) substitution method

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Steps to find the integral of cos(2x) using substitution
  1. Cowan Academy
  2. integral of cos(2x)
  3. integrate cos(2x)
  4. integral cos(2x)
  5. integration cos(2x)
  6. integration
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Комментарии
Автор

Lmao i completely forgot about substitution

godcolor
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Why's it that we only consider 2x as u and not the whole thing??

adithya
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TYVM man, you helped me on a college exam, cheers!

waldomirolealjunior
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I was forget to solve this by substitutional method,
Thank you

viru
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Thanks bro for help me
I was confuse in it😉

anshulgupta
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i just started studying integration and so i am not able to do them... i came to this solution, please can you correct it? that is how i did:
int (cos (2x)) dx =
int (2 * cos^2 (x) -1 ) dx=
2 * (int (cos^2 (x)) + int (-1) dx =
2 * (1/2) * ( x + sin x + cos x ) - x =
x + sin x + cos x - x =
sin x + cos x
thank you

silvyadav
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why exactly we find the derivative (the work you did at right side) isnt this supposed to be just integration, why are we finding derivative then??

ankitaaarya
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I wasted so much time thinking about it

isthatcar
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So you just go ahead and drop the du without explaining it away? Awesome

ruger