I have no idea how to do this.. I can't find a similar example in the book. Thanks for your help. First answer to explain it well will be chosen as Best answer..
Not sure what the question is.
When t = 0
r = 2 + 4 = 6
When t = 90
r = 2 + 0 = 2
When t = 180
r = 2 - 4 = -2
Link below is my screenshot of the whole plot
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Verified answer
Not sure what the question is.
When t = 0
r = 2 + 4 = 6
When t = 90
r = 2 + 0 = 2
When t = 180
r = 2 - 4 = -2
Link below is my screenshot of the whole plot