Find the Exact Value of the Secant of (5*Pi/6) Using the Unit Circle

The angle (5*Pi/6) radians is located on the unit circle. The x coordinate of this angle is the cosine of (5*Pi/6). The secant is written as 1/cosine(5*pi/6) and this is used to find the exact numerical value of the secant function. (A calculator would only give a numerical approximation.) In this problem it was not required to rationalize the denominator of the answer.

Timestamps
0:00 Introduction
0:28 sec(5*Pi/6)=1/cos(5*Pi/6)
0:45 Unit Circle

[K.r.i.ss.y]

Thank you much. I was so confused, and this helped me a lot.