e7iz Let f (z) - and I = dx. Jx2+9 co cos (7x) %3D z2+9 Then Res f(z)\z=3i e-21 Res f(z)\z=3i e-21 6i 12i Tte-21 and I = 3. -21 Tte and I = 6 the above is true the above is true Res f(z)\z=3i e-21 %3D 28i and I = ne-21 14

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