# Is #f(x)= 4sin(4x-(3pi)/8) # increasing or decreasing at #x=pi/12 #?

##### 2 Answers

Jul 12, 2018

The function is increasing

#### Explanation:

Calculate the first derivative and compute the sign at

The function is

The derivative is

Plugging in the value of

As

graph{(y-4sin(4x-3/8pi))=0 [-4.385, 4.386, -2.19, 2.197]}

Jul 12, 2018

#### Explanation:

then

so

thus the function