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Mathematics
Mathematics
Problem
A point
(
x
,
y
,
z
)
(x, y, z)
(
x
,
y
,
z
)
moves parallel to
x
y
xy
x
y
-plane. Which of the three variables
x
,
y
,
z
x, y, z
x
,
y
,
z
remain fixed
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