Calculate the modulus (absolute value or magnitude) of a complex number using the formula |z| = √(a² + b²). The modulus represents the distance from the origin in the complex plane.
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The modulus of a complex number z = a + bi is the Euclidean distance from the origin to the point (a, b) in the complex plane, computed as the square root of the sum of the squares of its real and imaginary parts.
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