Q187 · Practice questionTechnology-freeSimple familiar1 mark
QUESTION 187
Which set contains all solutions of ?
(A)
(B)
(C)
(D)
WORKED SOLUTION
1 markAnswer B
ANSWER
B.
Worked solution
Rationalisation gives . Its two square roots have modulus 1 and arguments , giving . C squares to -i, A has the wrong modulus, and D omits one root.
Equivalent mathematically justified methods accepted.
Exact answers unless a decimal accuracy is specified.
Select B.
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