Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

ZeroAT

  • 3 years ago

Calculus - > Integral -> Substitution The question is sin 3x cos 3x dx Solve it by integrating using substitution.

  • This Question is Closed
  1. Spacelimbus
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Do you know what the derivate of \[\Large \sin(3x)  \] is?

  2. Spacelimbus
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    derivative*

  3. geerky42
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    HINT: Let u be sin(3x).

  4. ZeroAT
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    How do you choose what to let u be? In this case you choose sin(3x) but why?

  5. Spacelimbus
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Takes some practice, but in case you consider taking u=cos(3x), that would also work. It's mainly about developing the idea of substitution. If you choose u=sin(3x) then: \[\Large \frac{du}{dx}=3\cos(3x) \]

  6. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy