How to evaluate cotangent using a calculator

The video tutorial explains that calculators often lack a cotangent key, and highlights the reciprocal relationship between cotangent and tangent. It instructs viewers on how to calculate cotangent by using the tangent function, specifically demonstrating with the angle π/8. The tutorial emphasizes the importance of setting the calculator to radians for accurate trigonometric calculations.

What are the keys that are typically not found on a basic calculator for trigonometric functions?

What is the approximate value of 1 divided by the tangent of π/8?