What is implicit differentiation and how do I do it?

1 min readdecember 17, 2021


AP Calculus AB/BC ♾️

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Explicit vs. Implicit Differentiation

By now, you've probably covered basic differentiation of a function y in terms of a single variable x. This is called explicit differentiation.
Implicit differentiation, on the other hand, is differentiating a variable in terms of another variable. We're not just taking the derivative of x or 8x+6 anymore, we're taking the derivative of whole equations like y = 8x+6 to find dy/dx.
Need a quick review on taking and finding derivatives, make sure you watch this 🎥 video introducing and explaining derivatives for a refresher.

Explicit Differentiation

  • Single variable function/relation
Example:
https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2F-rQZl3VlhZ7Dz.gif?alt=media&token=42a46c0e-abd1-4058-823f-fa7cca3a5175

Implicit Differentiation

  • More than one variable in the function/relation
Example: 
https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2F-YaaPr7SGun2u.gif?alt=media&token=82697ac6-a706-440d-bb57-18d80a801595
So how do you do implicit differentiation? Just apply the chain rule!
🌟 Example:
https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2F-dNXB1MAmqAgi.gif?alt=media&token=0697d204-69c1-4ebe-b034-1063bef45278
We can even simplify further to solve for dy/dx!
https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2F-mewPe7iPAiti.gif?alt=media&token=85c6c348-6625-40bb-ad9e-558eb835ea51
...And there you have it!

Implicit differentiation is useful in solving differential equations, where you'll need to solve for dy/dx. Some applications include optimization, e.g. finding the rate of change of volume with respect to the rate of change of time.
For more examples and help watch this video about 🎥 implicit differentiation and derivatives.

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👑Unit 1 – Limits & Continuity
🤓Unit 2 – Fundamentals of Differentiation
🤙🏽Unit 3 – Composite, Implicit, & Inverse Functions
👀Unit 4 – Contextual Applications of Differentiation
Unit 5 – Analytical Applications of Differentiation
🔥Unit 6 – Integration & Accumulation of Change
💎Unit 7 – Differential Equations
🐶Unit 8 – Applications of Integration
🦖Unit 9 – Parametric Equations, Polar Coordinates, & Vector-Valued Functions (BC Only)
Unit 10 – Infinite Sequences & Series (BC Only)
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