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Tangential flightmathematics

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In the previous section we mentioned that the partial derivatives \(\dfrac{∂f}{∂x}\) and \(\dfrac{∂f}{∂y}\) can be thought of as the rate of change of a function \(z = f (x, y)\) in the positive \(x\) and \(y\) directions, respectively. Recall that the derivative \(\dfrac{dy}{dx}\) of a function \(y = f (x)\) has a geometric meaning, namely as the slope of the tangent line to the graph of \(f\) at the point \((x, f (x))\) in \(\mathbb{R}^2\). There is a similar geometric meaning to the partial derivatives \(\dfrac{∂f}{∂x}\) and \(\dfrac{∂f}{∂y}\) of a function \(z = f (x, y)\): given a point \((a,b)\) in the domain \(D\) of \(f (x, y)\), the trace of the surface described by \(z = f (x, y)\) in the plane \(y = b\) is a curve in \(\mathbb{R}^ 3\) through the point \((a,b, f (a,b))\), and the slope of the tangent line \(L_x\) to that curve at that point is \(\dfrac{∂f}{∂x} (a,b)\). Similarly, \(\dfrac{∂f}{∂y} (a,b)\) is the slope of the tangent line \(L_y\) to the trace of the surface \(z = f (x, y)\) in the plane \(x = a\) (see Figure 2.3.1).

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For the function \(F(x, y, z) = x^2 + y^2 + z^2 −9\), we have \(\dfrac{∂F}{∂x} = 2x\), \(\dfrac{∂F}{∂y} = 2y\), and \(\dfrac{∂F}{∂z} = 2z\), so the equation of the tangent plane at (2,2,−1) is

Note that since two lines in \(\mathbb{R}^ 3\) determine a plane, then the two tangent lines to the surface \(z = f (x, y)\) in the \(x\) and \(y\) directions described in Figure 2.3.1 are contained in the tangent plane at that point, if the tangent plane exists at that point. The existence of those two tangent lines does not by itself guarantee the existence of the tangent plane. It is possible that if we take the trace of the surface in the plane \(x − y = 0\) (which makes a 45◦ angle with the positive \(x\)-axis), the resulting curve in that plane may have a tangent line which is not in the plane determined by the other two tangent lines, or it may not have a tangent line at all at that point. Luckily, it turns out that if \(\dfrac{∂f}{∂x}\) and \(\dfrac{∂f}{∂y}\) exist in a region around a point \((a,b)\) and are continuous at \((a,b)\) then the tangent plane to the surface \(z = f (x, y)\) will exist at the point \((a,b, f (a,b))\). In this text, those conditions will always hold.

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This page titled 2.3: Tangent Plane to a Surface is shared under a GNU Free Documentation License 1.3 license and was authored, remixed, and/or curated by Michael Corral via source content that was edited to the style and standards of the LibreTexts platform.

Let \(z = f (x, y)\) be the equation of a surface \(S\) in \(\mathbb{R}^ 3\), and let \(P = (a,b, c)\) be a point on \(S\). Let \(T\) be a plane which contains the point \(P\), and let \(Q = (x, y, z)\) represent a generic point on the surface \(S\). If the (acute) angle between the vector \(\vec{PQ}\) and the plane \(T\) approaches zero as the point \(Q\) approaches \(P\) along the surface \(S\), then we call \(T\) the tangent plane to \(S\) at \(P\).

\[\textbf{n} = \mathbf{v_x} × \mathbf{v_y} = \begin{vmatrix} \textbf{i} & \textbf{j} & \textbf{k} \\[4pt] 1 & 0 & \dfrac{∂f}{∂x}(a,b) \\[4pt] 0 & 1 & \dfrac{∂f}{∂y} (a,b) \end{vmatrix} =-\dfrac{∂f}{∂x}(a,b)\textbf{i}-\dfrac{∂f}{∂y}(a,b)\textbf{j}+\textbf{k} \nonumber \]

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Since the derivative \(\dfrac{dy}{dx}\) of a function \(y = f (x)\) is used to find the tangent line to the graph of \(f\) (which is a curve in \(\mathbb{R}^2\)), you might expect that partial derivatives can be used to define a tangent plane to the graph of a surface \(z = f (x, y)\). This indeed turns out to be the case. First, we need a definition of a tangent plane. The intuitive idea is that a tangent plane “just touches” a surface at a point. The formal definition mimics the intuitive notion of a tangent line to a curve.

where \(n = (A,B,C)\) is a normal vector to the plane \(T\). Since \(T\) contains the lines \(L_x\) and \(L_y\), then all we need are vectors \(v_x\) and \(v_y\) that are parallel to \(L_x \text{and } L_y\), respectively, and then let \(n = v_x × v_y\).

Suppose that we want an equation of the tangent plane \(T\) to the surface \(z = f (x, y)\) at a point \((a,b, f (a,b))\). Let \(L_x\) and \(L_y\) be the tangent lines to the traces of the surface in the planes \(y = b\) and \(x = a\), respectively (as in Figure 2.3.2), and suppose that the conditions for \(T\) to exist do hold. Then the equation for \(T\) is

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Since the slope of \(L_x\) is \(\dfrac{∂f}{∂x} (a,b)\), then the vector \(v_x = (1,0, \dfrac{∂f}{∂x} (a,b))\) is parallel to \(L_x\) (since \(v_x\) lies in the \(xz\)-plane and lies in a line with slope \(\dfrac{\dfrac{∂f}{∂x}(a,b)}{1} = \dfrac{∂f}{∂x} (a,b)\). See Figure 2.3.3). Similarly, the vector \(v_y = (0,1, \dfrac{∂f}{∂y} (a,b))\) is parallel to \(L_y\). Hence, the vector

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In a similar fashion, it can be shown that if a surface is defined implicitly by an equation of the form \(F(x, y, z) = 0\), then the tangent plane to the surface at a point \((a,b, c)\) is given by the equation

Polarization of light is a property that applies to turning waves that shows the geometrical blooming of the oscillations. In a turning wave, the way of the ...

For the function \(f (x, y) = x^2 + y^2\), we have \(\dfrac{∂f}{∂x} = 2x\) and \(\dfrac{∂f}{∂y} = 2y\), so the equation of the tangent plane at the point \((1,2,5)\) is