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Unformatted text preview: (10/7/08) Math 10C. Lecture Examples. Section 14.3. Local linearity and the differential Zooming in on level curves of a nonlinear z = f ( x , y ) If a function y = f ( x ) of one variable has a derivative at x and the graph y = f ( x ) is generated by a calculator or computer in a small enough window containing the point ( x , f ( x )), the displayed portion of the graph will look like a line. This occurs because the graph is closely approximated by the tangent line near that point. Graphs of functions of two variables with continuous first derivatives are closely approximated by planes in small windows. Consequently, their level curves at equal zincrements look like equally spaced parallel lines in small windows. This is illustrated by the level curves of K ( x, y ) = 3 x 2 y 3 + x in Figures 1 through 3. The level curves look more like equally spaced parallel lines in Figure 2 than Figure 1, and even more like equally spaced parallel lines in Figure 3. These approximate closely the level lines of theeven more like equally spaced parallel lines in Figure 3....
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This note was uploaded on 09/30/2011 for the course MATH 10C taught by Professor Hohnhold during the Spring '07 term at UCSD.
 Spring '07
 Hohnhold
 Calculus, Derivative

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