Write an expression as a single function using the sum and difference formulas

The video tutorial explains the concept of tangent and how to determine whether to add or subtract angles using the tangent formula. It guides the viewer through identifying angles U and V and demonstrates calculating the tangent of 66 degrees by adding 19 and 47 degrees.

Explain the significance of identifying U and V in the tangent formula.

What is the result of the tangent of 19 degrees plus 47 degrees?