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Given any Cartesian coordinates, (x,y), there are polar coordinates (?,?)(r,θ) with −?2<?≤?2.−π2<θ≤π2. Find polar coordinates with...

Given any Cartesian coordinates, (x,y), there are polar coordinates (?,?)(r,θ) with −?2<?≤?2.−π2<θ≤π2.
Find polar coordinates with −?2<?≤?2−π2<θ≤π2 for the following Cartesian coordinates:
(a) If (?,?)=(18,−10)(x,y)=(18,−10) then (?,?)=((r,θ)=(  ,  )),
(b) If (?,?)=(7,8)(x,y)=(7,8) then (?,?)=((r,θ)=(  ,  )),
(c) If (?,?)=(−10,6)(x,y)=(−10,6) then (?,?)=((r,θ)=(  ,  )),
(d) If (?,?)=(17,3)(x,y)=(17,3) then (?,?)=((r,θ)=(  ,  )),
(e) If (?,?)=(−7,−5)(x,y)=(−7,−5) then (?,?)=((r,θ)=(  ,  )),
(f) If (?,?)=(0,−1)(x,y)=(0,−1) then (?,?)=((r,θ)=( ,))

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