Math Problem Statement

Consider a complex number z = -i, where i = sqrt(-1). If the value of arg(z) + arg(z̄) + arg(arg(z)) + arg(Im(z)) (where arg(x) ∈ (-π, π], x is any complex number) is p/q π, where p and q are coprime positive integers, then the value of p + q is?

Solution

The image presents the following problem:


Consider a complex number z=iz = -i, where i=1i = \sqrt{-1}. If the value of

arg(z)+arg(z)+arg(arg(z))+arg((z))\text{arg}(z) + \text{arg}(\overline{z}) + \text{arg}(\text{arg}(z)) + \text{arg}(\Im(z))

(where arg(x)(π,π]\text{arg}(x) \in (-\pi, \pi], xx is any complex number) is equal to pqπ\frac{p}{q} \pi, where pp and qq are coprime positive integers, then the value of p+qp + q is:


Solution:

Given z=iz = -i, the complex number can be analyzed:

  1. Argument of zz: z=iz = -i In polar form, i-i has an argument of π2\frac{-\pi}{2}. Thus, arg(z)=π2\text{arg}(z) = -\frac{\pi}{2}

  2. Conjugate of zz (denoted z\overline{z}): z=i\overline{z} = i The argument of ii is π2\frac{\pi}{2}, so: arg(z)=π2\text{arg}(\overline{z}) = \frac{\pi}{2}

  3. Argument of arg(z)\text{arg}(z): Since arg(z)=π2\text{arg}(z) = -\frac{\pi}{2}, and the argument of a real negative number π2-\frac{\pi}{2} is π\pi, we have: arg(arg(z))=π\text{arg}(\text{arg}(z)) = \pi

  4. Argument of (z)\Im(z): The imaginary part of z=iz = -i is 1-1, which is a real negative number. The argument of 1-1 is π\pi, so: arg((z))=π\text{arg}(\Im(z)) = \pi

Now, adding all these arguments together:

arg(z)+arg(z)+arg(arg(z))+arg((z))=π2+π2+π+π=2π\text{arg}(z) + \text{arg}(\overline{z}) + \text{arg}(\text{arg}(z)) + \text{arg}(\Im(z)) = -\frac{\pi}{2} + \frac{\pi}{2} + \pi + \pi = 2\pi

We know that 2π=21π2\pi = \frac{2}{1}\pi, where p=2p = 2 and q=1q = 1, and pp and qq are coprime.

Therefore, p+q=2+1=3p + q = 2 + 1 = 3.

The value of p+qp + q is 3.


Would you like further details or have any questions?

Related Questions:

  1. How do you find the argument of complex numbers in polar form?
  2. What is the conjugate of a complex number and how is its argument calculated?
  3. How can you interpret the argument of real and imaginary parts of a complex number?
  4. What does it mean for two integers to be coprime?
  5. How does the principal argument differ from the general argument of a complex number?

Tip: Always remember that the argument of a complex number is typically restricted to the range (π,π](-\pi, \pi].

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Math Problem Analysis

Mathematical Concepts

Complex Numbers
Argument of Complex Numbers
Imaginary Numbers

Formulas

arg(z) + arg(z̄) + arg(arg(z)) + arg(Im(z))
arg(z) = -π/2
arg(z̄) = π/2
arg(arg(z)) = π
arg(Im(z)) = π

Theorems

Properties of complex arguments
Conjugate of complex numbers
Argument of real and imaginary parts

Suitable Grade Level

College Level or Advanced High School (Grades 11-12)