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1. Evaluate each integral by making an appropriate substitution. X d (2} '[1': T Ie.\\' _EY () | =dx le* +e (c) Iranxsec'xdx 2. Find the area of the region bounded above by the graph of g(x) =1 and below by the graph of f(x)=x" +2x-2. - 3. Let R be the closed region between the graphs of y = 2./x and =2x on the interval [0, 1]. Find the volume V of the solid obtained by revolving R about the x- axis. 4. Let R be the closed region between the graphs of y = 2/x and =2x on the interval