Convert to a polar equation.x2 + 4y2 = 4
A. 4 cos2? + sin2? = 4r
B. cos2? + 4 sin2? = 4r
C. r2(4 cos2? + sin2?) = 4
D. r2(cos2? + 4 sin2?) = 4
Answer: D
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A. 
B. 
C. 
D. 
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