(requires JavaScript)
Find an equation of the plane tangent to the surface
at the point .
Find an equation of the plane tangent to the surface
at the point .
Find an equation of the plane tangent to the surface
at the point .
and . Construct vectors tangent to the surface: and . Find a vector orthogonal to the surface: , and so the plane is .
Find the linear approximation of the function
at the point and use it to approximate .