Find the area enclosed between http://euler.vaniercollege.qc.ca/web...7f78a5a001.png and http://euler.vaniercollege.qc.ca/web...d9d094b661.png from http://euler.vaniercollege.qc.ca/web...e517fc5a21.png to http://euler.vaniercollege.qc.ca/web...c2c64b5631.png.

If I'm not mistaken, I now have to use the Fb - Fa formula. However, my answer turns out wrong so I'm assuming I made a mistake in the calculations shown above. Can someone please tell me where it is?