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Find the argument of the complex number 
2+2i in the interval 
0 <= theta < 2pi. Express your answer in terms of 
pi.

Find the argument of the complex number 2+2i 2+2 i in the interval 0 \leq \theta<2 \pi . Express your answer in terms of π \pi .

Full solution

Q. Find the argument of the complex number 2+2i 2+2 i in the interval 0θ<2π 0 \leq \theta<2 \pi . Express your answer in terms of π \pi .
  1. Understand Complex Number Argument: Understand the concept of the argument of a complex number. The argument of a complex number z=a+biz = a + bi, where aa and bb are real numbers, is the angle θ\theta in polar coordinates that the line connecting the origin to the point (a,b)(a, b) makes with the positive real axis. The argument is usually denoted as arg(z)\text{arg}(z) and is measured in radians.
  2. Convert to Polar Form: Convert the complex number to polar form to find the argument.\newlineFor the complex number 2+2i2+2i, we can find the argument by calculating the angle θ\theta using the formula θ=arctan(ba)\theta = \arctan(\frac{b}{a}), where aa is the real part and bb is the imaginary part of the complex number.
  3. Calculate Using Arctan: Calculate the argument using the arctan function.\newlineFor the complex number 2+2i2+2i, a=2a = 2 and b=2b = 2. Therefore, θ=arctan(22)=arctan(1)\theta = \text{arctan}(\frac{2}{2}) = \text{arctan}(1).
  4. Evaluate Arctan of 11: Evaluate the arctan of 11.\newlineThe arctan of 11 is π4\frac{\pi}{4} radians because the tangent of π4\frac{\pi}{4} is 11. This is a well-known value from trigonometry.
  5. Ensure Correct Interval: Ensure the argument is in the correct interval.\newlineSince we are looking for the argument in the interval 0 \leq \theta < 2\pi, and π/4\pi/4 is already in this interval, we do not need to adjust the value of the argument.
  6. Write Final Answer: Write the final answer.\newlineThe argument of the complex number 2+2i2+2i is π/4\pi/4 radians.

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