The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).x2 + 4y2 = 4
A. 4 cos2 ? + sin2 ? = 4r
B. r2(cos2 ? + 4 sin2 ?) = 4
C. r2(4 cos2 ? + sin2 ?) = 4
D. cos2 ? + 4 sin2 ? = 4r
Answer: B
Mathematics
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