10. z = −2 + i, |z| = √5, θ = Arg ( z) = π − tan −1(1/2) z = √5(cos θ + i
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10. √ z = −2 + i, |z| = 5, √ z = 5(cos θ + i sin θ ) θ = Arg (z) = π − tan−1 (1/2)