find min value of arg z when modulus of z+1-1*root3 = 1

To solve this problem, let us denote \( z \) as a complex number, which we can write as:

\[
z = x + yi
\]

where \( x \) and \( y \) are real numbers, and \( i \) is the imaginary unit. The given condition is:

\[
|z + 1 - i\sqrt{3}| = 1
\]

This represents the modulus (distance from the origin) of the complex number \( z + 1 - i\sqrt{3} \). We can rewrite this in the form of:

\[
|(x + 1) + (y - \sqrt{3})i| = 1
\]

This expression represents the distance from the point \((-1, \sqrt{3})\) to the point \((x, y)\), and it is equal to 1. Hence, \( (x, y) \) lies on a circle centered at \((-1, \sqrt{3})\) with radius 1.

To find the minimum value of \(\arg(z)\), which represents the angle \( \theta \) that \( z \) makes with the positive real axis, we need to think geometrically about the position of the circle and the angles involved.

### Step-by-Step Approach:

1. **Identify the Circle's Center and Radius**:  
   The center of the circle is at \((-1, \sqrt{3})\), and the radius is \(1\).

2. **Find the Argument**:  
   The argument of \(z\) is the angle between the line from the origin \((0, 0)\) to the point \( (x, y) \) on the circle and the positive real axis. 

3. **Geometric Interpretation**:  
   The minimum value of the argument will occur when the line from the origin to the point on the circle is closest to the positive real axis. This means we want to find the line that is tangent from the origin to the circle.

4. **Using Geometry to Find the Minimum Argument**:
   - The center of the circle is \((-1, \sqrt{3})\).
   - The radius is \(1\).
   - The distance from the origin to the center is:
   
     \[
     d = \sqrt{(-1)^2 + (\sqrt{3})^2} = \sqrt{1 + 3} = 2
     \]

   - Since the radius is \(1\) and the distance from the origin to the center is \(2\), we can use trigonometry to find the minimum argument. The angle between the line from the origin to the center and the tangent line is given by:

     \[
     \sin(\theta) = \frac{\text{radius}}{\text{distance from origin to center}} = \frac{1}{2}
     \]

     Therefore:

     \[
     \theta = \sin^{-1}\left(\frac{1}{2}\right) = \frac{\pi}{6}
     \]

### Conclusion:

The minimum value of the argument \(\arg(z)\) is \(\boxed{\frac{\pi}{6}}\).

Would you like me to explain any part of this solution in more detail, or do you have any further questions?

Here are 5 related questions to expand on this topic:
1. How do you calculate the modulus of a complex number?
2. What is the geometric representation of complex numbers in the Argand plane?
3. How can you determine the argument of a complex number given its Cartesian form?
4. What are some methods to find the distance between two points in the complex plane?
5. How do you determine if a complex number lies on a specific circle?

**Tip:** When solving problems involving modulus and arguments of complex numbers, drawing a diagram on the Argand plane can often provide clear geometric insight.

Learn how to solve a complex number problem by finding the minimum value of the argument when the modulus |z + 1 - i√3| = 1. This solution explores key concepts like the modulus and argument of complex numbers, using geometric interpretation and trigonometry.

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