### Learn math, science, English SAT & ACT from

high-quaility study
videos by expert teachers

##### Thank you for watching the preview.

To unlock all 5,300 videos, start your free trial.

# Evaluating the Tangent Function - Problem 2

###### Norm Prokup

###### Norm Prokup

**Cornell University**

PhD. in Mathematics

Norm was 4th at the 2004 USA Weightlifting Nationals! He still trains and competes occasionally, despite his busy schedule.

We're finding the tangent of other special angles. Right now I want to find the tangent of negative pi over 6. After you draw a diagram, the first thing you have to do is identify the reference angle and the reference angle is the angle between the terminal side and the x axis and you want to choose a positive angle and in this case it would be positive pi over 6.

And then you take the tangent of that angle. The tangent of pi over 6 is root 3 over 3 and finally you have to decide what the sine of tangent is in this quadrant. Now our tangent is positive in the first and third quadrants, so it's going to be negative in the fourth quadrant, therefore the tangent of negative pi over 6 is negative root 3 over 3.

Please enter your name.

Are you sure you want to delete this comment?

###### Norm Prokup

PhD. in Mathematics, University of Rhode Island

B.S. in Mechanical Engineering, Cornell University

He uses really creative examples for explaining tough concepts and illustrates them perfectly on the whiteboard. It's impossible to get lost during his lessons.

##### Concept (1)

##### Sample Problems (2)

Need help with a problem?

Watch expert teachers solve similar problems.

## Comments (0)

Please Sign in or Sign up to add your comment.

## ·

Delete