Find modulus and principal argument of z - -3 cos-9 - i sin-9 -

Given, z= 3 ( cosπ9 +isinπ9 #160; ) general formula, #160; z=r(cosθ +isinθ ) Modulus r= 3 Argument θ =π9 ...

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Modulus of a Complex Number

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Question

Find modulus and principal argument of $z = - 3 (cos \frac{π}{9} + i sin \frac{π}{9})$ .

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Solution

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