When a metallic ball bearing is placed inside a cylindrical container, of radius 2 cm, the height of the water, inside the conta
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You could rewrite 
as
and be tempted to cancel out the factors of
. But this cancellation is only valid when 
.
When
, you end up with the indeterminate form 
, which is why 
is not a zero.
and be tempted to cancel out the factors of
When