Complex Numbers - Basic Operations(identities and magnitude)

Further mathematics
MCQs part 7
(Complex numbers)
Average age 17years and above
If z=cosπ/6+isinπ/6
Then |z-1/z |=?
You know if z^n=cosnteta+isinnteta
Then the identity or formula
Z^n-1/z^n =2isin(nteta)
Applying this and simplifying will give D as right option of the mcq
Gce june18q5
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