# What is the equation of the normal line of #f(x)= cotx# at #x = pi/8#?

##### 1 Answer

Jan 10, 2018

#### Explanation:

To find the normal line, first find the slope of the tangent line of

This can be found by finding the derivative of

the slope of the normal like is the opposite reciprocal of that, which would be:

the point the normal line passes through is

use point-slope form: