Describe the graph of the polar equation.r2 + 2r2sin ? cos ? = 400
A. Two horizontal lines passing through (0, ±20)
B. Parabola opening upward with vertex at (0, 20)
C. Two straight lines of slope -1, y-intercepts (0, ±20)
D. Parabola opening to the right with vertex at (20, 0)
Answer: C
Mathematics
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