# What is the equation of the line tangent to # f(x)=x/secx # at # x=pi/3#?

##### 1 Answer

Apr 11, 2018

Since we are talking about a tangent this means we'll want to find the gradient at that point.

#### Explanation:

Using product rule:

Gradient at

Now the equation of the tangent can be found using this gradient and the point at which the tangent is

Using point-gradient formula:

This gives you: