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anonymous

  • one year ago

find....

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  1. anonymous
    • one year ago
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    |dw:1437386418657:dw|

  2. Astrophysics
    • one year ago
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    let u = cosx

  3. anonymous
    • one year ago
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    ahh. I chose sin x. alright ´give me a moment to solve this.

  4. Astrophysics
    • one year ago
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    Naw, you will see why to, and np take your time

  5. dan815
    • one year ago
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    |dw:1437386882138:dw|

  6. anonymous
    • one year ago
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    okey so \[\frac{ du }{ dx }=-\sin x\] \[\sin dx =-du\] \[\int\limits_{0}^{py/3} u^{3} *-1 du\] then you get

  7. anonymous
    • one year ago
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    |dw:1437386925478:dw|

  8. dan815
    • one year ago
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    |dw:1437386942356:dw|

  9. Astrophysics
    • one year ago
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    |dw:1437386975349:dw|

  10. anonymous
    • one year ago
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    so my final answer was |dw:1437387078578:dw|

  11. Astrophysics
    • one year ago
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    |dw:1437387056540:dw| dont forget to change the limits

  12. Astrophysics
    • one year ago
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    When you're making a u sub make sure to change the limits as well

  13. Astrophysics
    • one year ago
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    |dw:1437387169151:dw|

  14. UsukiDoll
    • one year ago
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    I would just sub that u back after we take the antiderivative so I won't have to change limits :P

  15. Astrophysics
    • one year ago
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    Or yeah you can do it that way, it doesn't really matter

  16. UsukiDoll
    • one year ago
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    |dw:1437387304792:dw|

  17. Astrophysics
    • one year ago
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    I just like doing it this way, it sometimes saves time haha

  18. UsukiDoll
    • one year ago
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    it's only half done @Xlegalize next you have to evaluate the integral

  19. UsukiDoll
    • one year ago
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    wahhhhhhhh I don't wanna sub old limits and get new ones ......... I rather just sub u back after antiderivative step and just evaluate so easier lezl

  20. Astrophysics
    • one year ago
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    What ever works for you :P

  21. anonymous
    • one year ago
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    ohh.. i thought it was done. how?

  22. UsukiDoll
    • one year ago
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    it was half done.. evaluating was missing at x = 0 cos(0) is 1

  23. Astrophysics
    • one year ago
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    Oh, you have to use fundamental theorem of calculus still so |dw:1437387420691:dw|

  24. UsukiDoll
    • one year ago
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    |dw:1437387439915:dw|

  25. Astrophysics
    • one year ago
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    Or pi/3* not negative :P

  26. anonymous
    • one year ago
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    thats exactly what I did after I got the answer 0.265, the correct is 0.234

  27. Astrophysics
    • one year ago
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    or is that suppose to be -pi/3?

  28. UsukiDoll
    • one year ago
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    |dw:1437387518604:dw|

  29. Astrophysics
    • one year ago
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    or pi/3 idk

  30. Astrophysics
    • one year ago
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    Yes you should get 15/64

  31. Astrophysics
    • one year ago
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    So it is pi/3

  32. UsukiDoll
    • one year ago
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    pi/3 is 1.04 something.. that's not 0.2.34

  33. Astrophysics
    • one year ago
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    Lol I have no clue what the intervals are

  34. anonymous
    • one year ago
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    soo strange.. now I get the right answer. maybe it depends on how I plug it into the calc? tho it shouldnt. But I did like this. -cos(pi/3)^4/4+cos(0)^4/4

  35. Astrophysics
    • one year ago
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    is that suppose to be pi/3 or -pi/3

  36. anonymous
    • one year ago
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    srry -pi/3

  37. Astrophysics
    • one year ago
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    Oh ok, let me just show you how to do it your way then

  38. UsukiDoll
    • one year ago
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    |dw:1437387699526:dw|

  39. UsukiDoll
    • one year ago
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    got em....

  40. UsukiDoll
    • one year ago
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    15/64 = 0.234375

  41. UsukiDoll
    • one year ago
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    I just evaluated...

  42. Astrophysics
    • one year ago
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    |dw:1437387751936:dw| right?

  43. UsukiDoll
    • one year ago
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    yeah

  44. Astrophysics
    • one year ago
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    |dw:1437387930922:dw| I'm doing it exactly the way you were doing/ would do it, just to make it clear.

  45. Astrophysics
    • one year ago
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    |dw:1437388080251:dw| right?

  46. UsukiDoll
    • one year ago
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    hey waitttt.... we have -pi/3 meaning -1/2

  47. Astrophysics
    • one year ago
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    It doesn't matter, cosx is an even function

  48. anonymous
    • one year ago
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    yeah. thats where it started falling off.

  49. Astrophysics
    • one year ago
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    |dw:1437388278120:dw|

  50. ali2x2
    • one year ago
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    a clif?

  51. ali2x2
    • one year ago
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    :P

  52. Astrophysics
    • one year ago
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    It doesn't really matter in this question though as it's ^4 meaning it will be positive anyways but yes, cosx is an even function :O

  53. ali2x2
    • one year ago
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    :o

  54. ali2x2
    • one year ago
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    lol i saw that

  55. Astrophysics
    • one year ago
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    Does that make sense though @Xlegalize

  56. anonymous
    • one year ago
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    Alright, it has been done:D Thanks for all ur time and help and patience.

  57. ali2x2
    • one year ago
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    Nice work everyone now i rest me case

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