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Let and . Evaluate:

  1. Notice that the bounds are reverse. What does that 'do' to the way we evaluate area?

  2. Two shifts happen to the integrand: It is shifted two units up. It is shifted two units right. The bounds also changed.

    Shifting up units is like adding the integral:

    In other words, it's like adding a rectangle with height and base .

    Shifting an integral to the right could make it impossible to evaluate.
    Fortunately, in this case, the bounds also shifted units to the right.