# How do you determine if a function is concave up/ concave down if #tanx+2x #on #(-pi/2, pi/2)#?

##### 1 Answer

Investigate the sign of the second derivative.

#### Explanation:

Let:

So

For

For

The function is concave down on

concave up on

The point

Jul 4, 2015

Investigate the sign of the second derivative.

Let:

So

For

For

The function is concave down on

concave up on

The point