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anonymous

  • 5 years ago

I need help on the intergral of cos (pi/20) :S

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  1. anonymous
    • 5 years ago
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    in your integration there is no variable please write the question properly.

  2. anonymous
    • 5 years ago
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    the full question is, pi/10 x cos (pi/20)

  3. anonymous
    • 5 years ago
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    i think \[\int\limits_{}^{}\cos \pi x/20dx\] let \[y=\pi x/20\] after this substitution you will get dx=20 dy/pi\[20/\pi \int\limits_{}^{}\cos y dy=-20\sin y/\pi =-(20/\pi)\sin (pix/20)\]

  4. anonymous
    • 5 years ago
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    sin(pi/20)

  5. anonymous
    • 5 years ago
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    see if there is no x under cosine function then it is simply a constant and you can take it outside the integration

  6. anonymous
    • 5 years ago
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    Thankyou so Much :D

  7. anonymous
    • 5 years ago
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    have you got your answer?

  8. anonymous
    • 5 years ago
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    Just doing it now (:

  9. anonymous
    • 5 years ago
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    ok.

  10. anonymous
    • 5 years ago
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    if you have any doubt please ask.

  11. anonymous
    • 5 years ago
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    Maths is hard.

  12. anonymous
    • 5 years ago
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    are you talking in general or you haven't understand any step of mine?

  13. anonymous
    • 5 years ago
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    General. Your steps helped alot.

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spraguer (Moderator)
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