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Integrals

Hey,

Is my working and answer correct? The answer in the textbook is a bit different. Maybe mistake? There seems to be a positive sin3x/3 in the textbook answer, but i got negative sin3x/3

Question, answer and workings attached.
(edited 11 years ago)
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Original post by Putch1
Hey,

Is my working and answer correct? The answer in the textbook is a bit different. Maybe mistake? There seems to be a positive sin3x/3 in the textbook answer, but i got negative sin3x/3

Question, answer and workings attached.

cos(-3x)≠-cos3x. cos is an even function so cos(-3x) = cos(3x).
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Putch1
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Original post by Farhan.Hanif93
cos(-3x)≠-cos3x. cos is an even function so cos(-3x) = cos(3x).


Oh :P Thanks for the help. :smile:

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