Evaluate the expression for the composition of inverse sine and cosine

The video tutorial covers the calculation of the cosine of 5π/6, starting with an introduction to the concept and the importance of reference angles. It explains how to determine the reference angle and use the unit circle to find the cosine value, noting that it is negative in the second quadrant. The tutorial also includes a reminder on performing function compositions, emphasizing the need to start with the innermost function. The session concludes with final observations and a recap of the key points discussed.

What is the reference angle for 5π/6?

• π/3

• π/4

• π/6

• π/2

What is the cosine value of π/6?

• 0

• 1/2

• sqrt(3)/2

• sqrt(2)/2

In which quadrant is the cosine of 5π/6 negative?

• First quadrant

• Second quadrant

• Third quadrant

• Fourth quadrant

What is the sine value of π/3?

• sqrt(2)/2

• 1/2

• sqrt(3)/2

• 0

When composing functions, which function should be evaluated first?

• The outermost function

• The innermost function

• The function with the highest degree

• The function with the lowest degree