[15 points] Express each of the following numbers in Cartesian form (a + jb) without using a calculator. (You can use a calculator to check your work, but you should hand in a solution that shows you can solve this by hand. Numbers such as 9/17 and e² are acceptable without being converted to decimal form.) (a) z = (2+3j) – (4 - 2j) (b) z=ej/3 +e-j/3 +€³2π (c) z (d) z = ¹+2 (e) z = ji = 3³/3

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