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8-42.
  1. No calculator! Evaluate the integrals below. Homework Help ✎
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Before integrating, make a choice:

or You could let U = 9 − 2x.

Don't forget the absolute value!

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

Factor before integrating.

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