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# 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.

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###### 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.

Thiswas EXCELLENT! I am a math teacher and have been looking for an easy/logical way to explain the lateral area of a cone to my students and this was incredibly helpful, thank you very much!”

I just learned more In 3 minutes of polygons here than I do in 3 weeks in my math class”

Hahaha, his examples are the same problems of my math HW!”

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