Chapter 9.1, Problem 52E

30.1. Show that z = 0 is a removable singularity of the following functions. Furthermore, define f(0) such that these functions are analytic at z = 0. (a). f(z) = 2 sin z- z 1-12² - cos z (b). f(z) = (c). f(z) = sin 22

3. Consider the polynomial equation 6-iz+7z² -iz³ +z = 0 for which the roots are 3i, -2i, -i, and i. (a) Verify the relations between this roots and the coefficients of the polynomial. (b) Find the annulus region in which the roots lie.

30.3. Find and classify the isolated singularities of the following func- tions: (a). 23+1 22(2-1) (b). ²e¹/, (c). sin 3z (d). COS 2

3. Consider the polynomial equation 6-iz+7z2-iz³ +z = 0 for which the roots are 3i, -2i, -i, and i. (a) Verify the relations between this roots and the coefficients of the polynomial. (b) Find the annulus region in which the roots lie.

Determine the set of odd primes p for which 23 is a quadratic residue.

Q/ Find and classify the singularities of the functions- = 52+3 (1-2) sin² Z a fcz) b f(z) = tanz Z © f(2)= [z (e²-1)]

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