# How do you find the number c that satisfies the conclusion of Rolle's Theorem for #f(x) = cos(5x)# for [π/20,7π/20]?

##### 1 Answer

Jun 17, 2015

Solve

#### Explanation:

the conclusion of Rolle's Theorem is that there is a

For

We need to solve

Or at

Clearly, the only solution in the interval occurs when we take