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(a) Express {1 Vii)? in Cartesian form. (b) Find all complex numbers z which satisfy the equation z3+1=0, and show them on an Argand diagram.

(a) Express {1 Vii)? in Cartesian form. (b) Find all complex numbers z which satisfy the equation z3+1=0, and show them on an Argand diagram. (c) Find all complex numbers 2: which satisfy the equation z++zi=4+5

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