2009 Calculus #5:
The answer should be -cos(8)/32 - 63/32. In the final step, the t^2/4 and -2t terms both disappeared in the official solution, but they actually add up to -3. Also, 1/16 and cos(8)/16 should be replaced by 1/32 and cos(8)/32 respectively.
This bug was reported by Colin Aitken on 21 December 2010.