(a) Show that w = z has the values (b) Obtain from (18) the often more practical...
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(b) Obtain from (18) the often more practical formula
where sign y = 1 if y ¥ 0, sign y = -1 if y < 0, and all square roots of positive numbers are taken with positive sign. Use (10) in App. A3.1 with x = θ/2.
(c) Find the square roots of -14i, -9 - 40i, and 1 + 48i by both (18) and (19) and comment on the work involved.
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