Section 4.2, page 122

1. (#1)

   This is a direct consequence of the definition. Choose
   any partition whose mesh size goes to zero and plug in.

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2. (#3d.)

   Note that (-1/2) (t^2 +i)^(-1) is an antiderivative.
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3. (#9)

   In this case the parametrization for gamma is given:
   gamma(t) = t +it^2.  Hence Re(gamma) = t and Im(gamma)=t^2.
   So, for x use Re(gamma) and for y use Im(gamma) in the 
   integral.
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