Unformatted text preview: e z = z if and only ifπ < Im z < π . 4. Find the derivative of the principal branch of z 1+ i at z = i . 5. Show that cos1 z =i log ( z + ( z 21) 1 / 2 ) . 6. p.129 1, 2....
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 Spring '08
 Hou
 Ring, Logarithm, 2k, z−w z+w sin

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