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About LinkBacksGiven the surfacesand
they have a common plane which passes through
how can I get the common plane?
Please, please, please, state the problem as it is actually given to you! I am absolutely cerrtain the problem does NOT say "they have a common plane" because there is no such thing as a "common plane" for two surfaces or even "a plane" for a given surface. I can guess that you mean "a common tangent plane" but that missing word is very important!Originally Posted by Soldier
Given the surfaces
Assuming you really mean "common tangent plane", write the first surface asso that we can think of the surface as "level surface" for f. The gradient of f,
is a normal vector to that surface and so to its tangent plane, at any given x, y, z. Taking the point at which the plane is tangent to the surface as
then any tangent plane to the surface at that point and that passes through (2, -3, 1), is of the form
.
Similarly,we can write the second surface asso that grad g=
is normal to the surface and tangent plane. Taking
as point of tangency, the tangent plane that contains (2, -3, 1) is of the form
.
The fact that this is a common tangent plane means that we must havefor all x, y, z and so that "corresponding coefficients" are equal: we must have
,
, and
.
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