Solve.4x2 + y2 = 92x2 - y2 = 21
A. (-
, -i
), (-
, i
), (
, -i
), (
, i
)
B. (-
, -
), (-
, 
), (
, -
), (
, 
)
C. (
, -i
), (
, i
)
D. (-
, i
), (
, i
)
Answer: A
Mathematics
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A. i
B. -i
C. 
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.
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