# How do you differentiate #f(x)= tanx# twice using the quotient rule?

##### 1 Answer

#### Explanation:

In order to start properly, let's just remember that

The quotient rule states that for a function

So, as for your function:

From trigonometric identities, we know that

To find the second derivative, use the chain rule, which states that for a function

First, rewrite

Then, according to the chain rule:

Your interpretation of a final answer could vary.