Answers to quiz 2
1. (2i)
^{1/2}
= 1+i, −1−i (Sect.14, Example 2)
2. If Re z = 0 then z = iy, cos iy = cosh y (Eq. 12.4) is a real number. If Im z = 0 then z = x, cos x is a real number. In both cases Im(cos z) = 0.
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