Introduction to Polar Coordinates

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...Good day Miss Stacey, Your explanation of the exercises about polar coordinates (I find them very interesting) could not be clearer to obtain a good basic understanding. I just have a brief comment/question regarding finding angle Theta at about time 10:17. Is it also possible to find angle Theta using tan(Theta) = -2/2 = -1 --> Theta = -pi/4, and so at least we obtain a so-called reference angle of pi/4 to begin with, and then applying the given (restriction) interval, am I right?! Thank you for your clear presentation... Take care, Jan-W

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