Pts find z z 2 1 z dzsolution let u 1 z so du dz then

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4. (4 pts) Find(z+ 2)1-z dz
5. (4 pts) Find4-x3dx.
6. (4 pts) The inverse tan function is called arctanx. It has the property that its derivative is (1 +x2)-1, soddxarctanx=11 +x2,Zdx1 +x2= arctanx+C.Use this fact, and integration by parts, to findZarctanx dx.

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