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Find the pricipal argument of each of ...

Find the pricipal argument of each of the following:
(a) `-1-isqrt(3)`
(b) `(1+sqrt(3)i)/(3 +i)`
(c) `sin alpha + i(1-cos alpha), 0 gt alpha gt pi`
(d) `(1+ isqrt(3))^(2)`

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