De Moivre's Theorem and Roots of Complex Numbers

1. csc Zl + sec z2 where Zl = 4 cis 0.5; u = 2. cos2 (13 8i) 3. tan[tan(6 i)] 2 cis (0.3) 4. In(lnzl) + In(lnz2) where zl = 2 + i; = In Zl In z2 5. where Zl + In 3