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NOTE: Show all steps in your solutions. Only partial credit will be given if steps are not shown though the final answer is c

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so: 1 Let cotz cot (xtiy) 9 2. Sin (n-iy cot (x+iy) Ces (atiy) 2 sin (x-iy) sin (utiy) Multiplying both sides by (ie denomina The imaginary part is a Sinthay Carn cash (2y) - dinh2y cash (27) - (ny) Ces au-

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