The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).x2 = 4y
A. 4 sin2 ? = r cos ?
B. 4 cos2 ? = r sin ?
C. r sin2 ? = 4 cos ?
D. r cos2 ? = 4 sin ?
Answer: D
Mathematics
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A. 
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A. 
B. 0
C. 1
D. 
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