### Home > CALC > Chapter 6 > Lesson 6.4.2 > Problem 6-148

6-148.

The last remaining parent graph without a derivative is the circle *x*^{2} + *y*^{2} = 1*. *Find

Recall that a circle is NOT a function.

Before differentiating, you could solve for *y* and get

Then find the derivative of each piece separately, or.....

You could use implicit differentiation!

Implicit differentiation: