Given any Cartesian coordinates, (x,y), there are polar coordinates (r,θ) with −π/2<θ≤π/2. Find polar coordinates with −π/2<θ≤π/2 for the following Cartesian coordinates: (a) If (x,y)=(10,1) then (r,θ)=( , ) , (b) If (x,y)=(14,−3) then (r,θ)=( , ) , (c) If (x,y)=(−6,3) then (r,θ)=( , ) , (d) If (x,y)=(14,9) then (r,θ)=( , ) , (e) If (x,y)=(−4,−6) then (r,θ)=( , ) , (f) If (x,y)=(0,−4) then (r,θ)=( , ) .