# Is #f(x)= cot(-x+(5pi)/6) # increasing or decreasing at #x=pi/4 #?

##### 2 Answers

Jul 18, 2018

**Increasing**

#### Explanation:

Given function:

Differentiating above equation w.r.t.

setting

Since,

Jul 18, 2018

since we get

#### Explanation:

At first we not that

so

and

Note that