The video tutorial explains the composition of sine and arc cosine functions, focusing on evaluating the inverse cosine of -sqrt(2)/2. It guides viewers through determining the angle using the unit circle, ensuring it falls within the range of 0 to π. The angle is found to be 3π/4, and the sine of this angle is calculated, resulting in sqrt(2)/2. The tutorial concludes by confirming the sine of the arc cosine of -sqrt(2)/2 equals the positive sqrt(2)/2.

What is the angle whose cosine is -√2/2?

• π/4

• 3π/4

• π/2

• π

Which function is evaluated first in the composition of sine and arc cosine?

• Sine

• Tangent

• Cosine

• Arc Cosine

What is the sine of the angle 3π/4?

• √2/2

• 0

• -√2/2

• 1

Why is it important to ensure the angle is within the range for the cosine function?

• To avoid errors in calculation

• To maintain the function's domain

• To ensure the angle is positive

• To simplify the problem

What is the final result of the sine of the arc cosine of -√2/2?

• 1

• 0

• -√2/2

• √2/2