ifunfrank
[AP Cal] Evaluate the following definite integral



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ifunfrank
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\[\int\limits_{0}^{\frac{ \pi }{ 6 }}\cos 3xdx\]

him1618
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put 3x=t

MarcLeclair
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do you really need to use substitution here O_O?

MarcLeclair
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oh nvm me hes right

ifunfrank
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so do i use substitution method?

him1618
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yes ys

him1618
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3x=t
3dx=dt
dx=dt/3
that makes it
1/3 x cost dt

ifunfrank
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okay, i set 3x = u, now?

him1618
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see above

ifunfrank
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where is the x before cost coming from?

him1618
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thst is mltiply