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Two surfaces are said to be orthogonal at a point P if the normals to their tangent planes are perpendicular at P. Show that the surfaces z= 1/2(x²+y² -1) and z=1/2(1- x²-y²) are orthogonal at all points of intersection.
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normals of a surface are given by partial derivitives by:
Last edited by luca-deltodesco (2008-04-22 18:35:31)
The Beginning Of All Things To End.
The End Of All Things To Come.
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