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No calculator! Evaluate the integrals below.

  1. Before integrating, make a choice:
    You could factor out  or you could let U = 9 − 2x.

    Don't forget the absolute value!

  1. Notice the symmetrical bounds.Is this function odd? If so, the area will be 0. If not, integrate.

  1. Factor before integrating.

  1. Recall that .

  1. U-substitution. Should U = sinx or U = cosx?