# What is the surface area produced by rotating #f(x)=sinx/cosx, x in [0,pi/4]# around the x-axis?

##### 1 Answer

Mar 5, 2016

Curved-surface cone , with vertex at the origin and base unit circle generated by the rotation of the terminal point of the curve

#### Explanation:

In nature, similar vertical pyramids are created by lava, from volcanic eruptions.