Graph the unit circle x2+ y2 =1 using the equations   and Y2 = −Y1 in the given viewing re...

Graph the unit circle x2+ y2 =1 using the equations   and Y2 = −Y1 in the given viewing rectangle. Then discuss how the viewing rectangle affects the graph, and determine the viewing rectangle that results in a graph that most looks like a circle.

(1) [−2, 2]by [−2, 2]

(2) [−3, 3]by [−2, 2]

(3) [−2, 2]by [−5, 5]

(4) [−5, 5]by [−2, 2]