28. If tan log (x + iy)= a + ib, then
tan {log (x2 +
y2)} equal to
2ab
2b
(a)
1-a² - 6²
1 + a² +6²
2a
2ab
(c) i-a² - 6²
(b)
2
2
(d) 1-a? - 62
2
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