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# Integrals watch

1. 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

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2. (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

cos(-3x)≠-cos3x. cos is an even function so cos(-3x) = cos(3x).
3. (Original post by Farhan.Hanif93)
cos(-3x)≠-cos3x. cos is an even function so cos(-3x) = cos(3x).
Oh :P Thanks for the help.

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