Question: 4. (a) Simplify the expression in both Cartesian form and polar form (in terms of the principal argument). 7 Use your answer to calculate cos

4. (a) Simplify the expression in both Cartesian form and polar form (in terms of the principal argument). 7 Use your answer to calculate cos ( ) . {b} Find all 2 that satisfy the equation 222234(z1)i=. (c) Find all 2 that satisfy the equation %z4 + 1 = t, and show them on an Argand diagram

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