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ifunfrank

  • 3 years ago

[AP Cal] Evaluate the following definite integral

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  1. ifunfrank
    • 3 years ago
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    \[\int\limits_{0}^{\frac{ \pi }{ 6 }}\cos 3xdx\]

  2. him1618
    • 3 years ago
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    put 3x=t

  3. MarcLeclair
    • 3 years ago
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    do you really need to use substitution here O_O?

  4. MarcLeclair
    • 3 years ago
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    oh nvm me hes right

  5. ifunfrank
    • 3 years ago
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    so do i use substitution method?

  6. him1618
    • 3 years ago
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    yes ys

  7. him1618
    • 3 years ago
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    3x=t 3dx=dt dx=dt/3 that makes it 1/3 x cost dt

  8. ifunfrank
    • 3 years ago
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    okay, i set 3x = u, now?

  9. him1618
    • 3 years ago
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    see above

  10. ifunfrank
    • 3 years ago
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    where is the x before cost coming from?

  11. him1618
    • 3 years ago
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    thst is mltiply

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