Implicit and Explicit Differentiation The equation describes an ellipse.
a. Use implicit differentiation to find its slope at the points (8, 3) and (8, -3).
b. Solve the equation for y, obtaining two functions, and differentiate both to find the slopes at x = 8. [Answers should agree with part (a).]
c. Use a graphing calculator to graph the two functions found in part (b) on an appropriate window. Then use NDERIV to find the derivatives at x = 8. [Your answers should agree with parts (a) and (b).]
Notice that differentiating implicitly was easier than solving for y and then differentiating.
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