### Home > CALC > Chapter Ch3 > Lesson 3.4.4 > Problem 3-188

3-188.

Though the derivative does not exist, some graphing calculators (inaccurately) say that the derivative is 0 at a cusp.

3-188.

Though the derivative does not exist, some graphing calculators (inaccurately) say that the derivative is 0 at a cusp.