Q. Find the argument of the complex number 2−2i in the interval 0≤θ<2π. Express your answer in terms of π.Answer:
Calculate Argument using atan2: To find the argument of a complex number in the form a+bi, where a is the real part and b is the imaginary part, we can use the formula θ=atan2(b,a), where atan2 is the two-argument arctangent function that takes into account the signs of both arguments to determine the correct quadrant of the angle.For the complex number 2−2i, we have a=2 and b=−2.
Identify Quadrant: We calculate the argument using the atan2 function: θ=atan2(−2,2). Since both the real and imaginary parts are equal in magnitude but opposite in sign, the argument is in the fourth quadrant.
Calculate Alpha: In the fourth quadrant, the argument of the complex number is 2π−α, where α is the angle formed with the positive x-axis. Since the real and imaginary parts are equal in magnitude, α is 45 degrees or π/4 radians.
Final Argument Calculation: Therefore, the argument θ is 2π−4π, which simplifies to 47π.
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