Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

UsukiDoll

  • 2 years ago

Quick question what is the antiderivative of 3sinxcosx?

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

    wouldn't my u be sinx and du cosx?

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

    Anti derivative .. hmn wait

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

    Can we say ; antiderivative as "integration" also?

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

    @mathslover yes we can

  5. mathslover
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    @.Sam. Please let me try?

  6. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I just need to know what the antiderivate of 3sinxcosx is and yes I am integrating from crud hold up let me find it. Got hazelnut on my fingers

  7. mathslover
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    is it : \(\frac{-3}{2}cos^2x\) ?

  8. mathslover
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    OH + C there also

  9. .Sam.
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\int\limits_{}^{}3sinxcosx~dx \\ \\ Let~u=sinx \\ \\du=cosx~dx \\ \\ Then, \\ \\ \int\limits_{}^{}3u~du \\ \\ Integrate\]

  10. mathslover
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    @UsukiDoll you were at right process.

  11. .Sam.
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @mathslover oh sry didn't see your comment there.

  12. mathslover
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    :) No problem @.Sam. , it is so nice of you to even say "sry" no mistake of yours' . Though, can you tell whether I am correct or not (scroll up to see my answer)

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

    \[\int\limits_{0}^{\frac{\pi}{2}}\] 3cos(x)sin(x)dx=\[\frac{3}{2}\]

  14. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I need the antiderivative of 3sinxcosx integrating from pi/2 to 0. umm that's what I did. like u sinx du cosx and then it's 3/2 u^2 but for some reason my manual has it at 3/2 sin2t. ummm WHAT!

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

    @UsukiDoll ok got it

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

    @mathslover am i right

  17. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    sin^2t maybe but sin2t? what the heck

  18. mathslover
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    ==lol

  19. .Sam.
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @mathslover yes you are

  20. ByteMe
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    why not just u=sinx so du=cosxdx ???

  21. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ummm that's what I did bytemr

  22. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    oops yes a =0 b = pi/2

  23. ByteMe
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    lol.... you said my name...

  24. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    loloolol

  25. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I could've sworn it was like this... |dw:1349253100916:dw|

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

    3sinx cos x = 3/2 sin 2x does this ring the bell ?

  27. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Why is it sinx 2x?!?!?!?!?!?!?!!?

  28. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    is there an identity that I missed @hartnn

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

    double angle formula: sin 2x = 2 sin x cos x cos 2x = cos^2 x- sin^2 x = 2cos^2x -1 = 1-2sin^2 x

  30. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yeah but that 2sinxcosx not 3sinxcosx and why is the 2 below the 3 in this one?

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

    @mathslover you were typing something ? 3sin x cos x = 3/2 (2sin x cos x) = 3/2 sin 2x

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

    its antiderivative will be -3/4 cos 2x

  33. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    again what I don't understand is why the 3/2? the problem is 3sinxcosx. There is no 2sinxcosx. so what Do i DO?

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

    so u did not understand this ? 3sin x cos x = 3/2 (2sin x cos x) i just multiplied and divided by 2

  35. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ohhhhh..... -___-|dw:1349253933438:dw|

  36. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    that's legal? multiplying 2 and dividing 2?

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

    absolutely! because 2 is constant.

  38. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    O______O!

  39. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ummm what math class is this normally in? Is it in trig?

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

    those double angle formulas? in trignometry..

  41. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    no about the 3/2 2sinxcosx

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

    its general, no particular topic, u can do that anytime, anywhere...

  43. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    THE HECK?

  44. UsukiDoll
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I got one more...so I'm opening a new question.

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

    ok.

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

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.