Calculate 50% of 200
2 answers:
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The directional derivative of a function 
in the direction of 
is given by
We have
, so that 
, at which point we're given
We're also given that, in the direction of
with 
, we have
So in the direction of
, with 
, we have
We have
We're also given that, in the direction of
So in the direction of