MediumParametric & polar

Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §9.1 Polar Coordinates, #18 · Calculus · Parametric & polar

True or false, with a reason or an example: (a) Changing to…

True or false, with a reason or an example:
(a) Changing to $- r$ and $- θ$ produces the same point.
(b) Each point has only one $r$ and $θ$ , when $r < 0$ is not allowed.
(c) The graph of $r = 1/ sin θ$ is a straight line.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §9.1 Polar Coordinates, #18

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