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Simplify to the form a+ib 1-i (b) 1+i 4+ 5i (c) 6-5i 4i (d) (1+2i)?

 

Simplify to the form a+ib 1-i (b) 1+i 4+ 5i (c) 6-5i 4i (d) (1+2i)?

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