Evaluating the difference of two angles for the tangent function

The video tutorial covers the tangent of the difference of two angles, explaining the formula and its application. The teacher guides students through the process of evaluating the tangent using given angles, emphasizing the importance of simplifying fractions and understanding the unit circle. The session concludes with a final calculation and checks for common factors in the result.

Explain how to find a common denominator when adding fractions.

What is the final answer after simplifying the expression 16/63?