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January 25, 2015

January 25, 2015

Posted by **hamlet** on Sunday, April 29, 2012 at 8:21am.

y=0, y= \cos(x), x = \frac{\pi}{2}, x = 0 about the axis y= -3

You might need to use the identity: cos^2(x) = \frac{1}{2}(cos(2x) + 1).

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