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Section 2.5

Section 2.5. Implicit Differentiation. When we take a derivative, we are normally taking it with respect to ( wrt ) x, but what if there isn’t an x involved? What do we do then?.

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Section 2.5

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  1. Section 2.5 Implicit Differentiation

  2. When we take a derivative, we are normally taking it with respect to (wrt) x, but what if there isn’t an x involved? What do we do then? So basically what we do is take the derivative of the function, then take the derivative of the y, which is our .

  3. This is not a function, but it would still be nice to be able to find the slope. Do the same thing to both sides. But if we are taking the derivative, what are we solving for?

  4. 1 Differentiate both sides w.r.t. x. 2 Solve for . This can’t be solved for y. This technique is called implicit differentiation.

  5. Guidelines for Implicit Differentiation 1. Differentiate both sides of the equation wrtx. 2. Collect all terms involving on the left side of the equation and move all other terms to the right side of the equation 3. Factor out of the left side of the equation. 4. Solve for .

  6. We need the slope. Since we can’t solve for y, we use implicit differentiation to solve for . Find the equations of the lines tangent and normal to the curve at . Note product rule.

  7. Find the equations of the lines tangent and normal to the curve at . tangent: normal:

  8. Find if . Substitute back into the equation. Higher Order Derivatives HW Pg. 146 1-15 odds, 21- 33 odds, 28, 45-49 odds

  9. Implicit surface A visualization of an implicit surface, defined by an equation in the 3 coordinates. Z-Flux contains a powerful engine to render implicit surfaces. In addition, a script can visualize any LaTex-formatted mathematical expression in 3D in the animation.

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