A mother explains to her child that the price on the sign is not the total price for an oil painting, because the price does not
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Use pythagoras theorem to find height. you get, h=4. so volume ,
u get,v=
u get,v=
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