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z=-8+3i
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=8+3i z=-8+3 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=8+3i z=-8+3 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=8+3iz = -8 + 3i, where the real part is 8-8 and the imaginary part is 33.
  2. Calculate angle theta: Calculate the angle θ\theta using the arctangent function.\newlineThe angle θ\theta in the complex plane is given by the arctangent of the imaginary part divided by the real part, which is arctan(38)\text{arctan}(\frac{3}{-8}). However, since the real part is negative and the imaginary part is positive, the angle lies in the second quadrant.
  3. Use arctangent function: Use a calculator to find the arctangent of 38\frac{3}{-8}. \newlineθ=arctan(38)arctan(0.375)\theta = \arctan\left(\frac{3}{-8}\right) \approx \arctan(-0.375)
  4. Calculate theta in radians: Calculate the approximate value of theta in radians. θ0.359\theta \approx -0.359 (in radians, using a calculator)
  5. Adjust angle in quadrant: Adjust the angle to lie in the correct quadrant.\newlineSince the angle is in the second quadrant, we need to add π\pi to the calculated value to get the angle between π-\pi and π\pi.\newlineθ=0.359+π\theta = -0.359 + \pi
  6. Calculate final theta: Calculate the final value of theta.\newlineθ0.359+3.142\theta \approx -0.359 + 3.142 (using the approximation π3.142\pi \approx 3.142)\newlineθ2.783\theta \approx 2.783 (in radians)

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