Another pair with r > 0 is (3, 9π/4); add 2π to the original π/4
with r < 0 is (3, 5π/4); add π to the original π/4 *
with r < 0 is (3, 5π/4); add π to the original π/4

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__________________________ The position of the point is shown on the picture.
__________________________ The position of the point is shown on the picture.
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