Find a rectangular equation for the following curve and describe the curve. Do not use a calculator. in [0:1] x=9 cos ²t, y =9 sin ²t; fort in What is the rectangular equation for the given curve? y=0 Describe the curve. Choose the correct answer below. O A. hyperbola (upper branch) O B. ellipse OC. circle with radius 9 O D. line segment

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