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z=3-4i
Find the angle 
theta (in radians) that 
z makes in the complex plane. Round your answer, if necessary, to the nearest thousandth. Express 
theta between 
-pi and 
pi.

theta=

z=34i z=3-4 i \newlineFind the angle θ \theta (in radians) that z z makes in the complex plane. Round your answer, if necessary, to the nearest thousandth. Express θ \theta between π -\pi and π \pi .\newlineθ= \theta=

Full solution

Q. z=34i z=3-4 i \newlineFind the angle θ \theta (in radians) that z z makes in the complex plane. Round your answer, if necessary, to the nearest thousandth. Express θ \theta between π -\pi and π \pi .\newlineθ= \theta=
  1. Identify Parts of zz: Identify the real and imaginary parts of the complex number zz.z=34iz = 3 - 4i, where the real part is 33 and the imaginary part is 4-4.
  2. Calculate Magnitude of z: Calculate the magnitude of z. The magnitude of z is given by the square root of the sum of the squares of the real and imaginary parts. z=32+(4)2=9+16=25=5|z| = \sqrt{3^2 + (-4)^2} = \sqrt{9 + 16} = \sqrt{25} = 5.
  3. Find Theta Using Definition: Use the definition of the argument of a complex number to find θ\theta. The argument of a complex number, θ\theta, is the angle the line connecting the origin to the point (real, imaginary) makes with the positive real axis. θ=arctan(imaginary partreal part)=arctan(43)\theta = \arctan(\frac{\text{imaginary part}}{\text{real part}}) = \arctan(\frac{-4}{3}).
  4. Calculate Theta with Arctan: Calculate θ\theta using the arctan function.θ=arctan(43)\theta = \text{arctan}(-\frac{4}{3}).Since the complex number is in the fourth quadrant (real part is positive, imaginary part is negative), we need to add π\pi to the result of arctan to get the angle in the correct range.θ=arctan(43)+π\theta = \text{arctan}(-\frac{4}{3}) + \pi.
  5. Use Calculator for Theta: Use a calculator to find the value of theta.\newlineθ=arctan(43)+π0.927+3.1422.215\theta = \arctan(-\frac{4}{3}) + \pi \approx -0.927 + 3.142 \approx 2.215 (rounded to the nearest thousandth).
  6. Verify Theta Range: Verify that theta is within the correct range. The range for theta is between π-\pi and π\pi. Since 2.2152.215 is within this range, our answer is valid.

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