Evaluate the inverse trig with composition

The video tutorial focuses on understanding the unit circle and the concept of cosine. It explains how to interpret cosine as adjacent over hypotenuse and explores the use of cosine inverse to find angles not on the unit circle. The tutorial further demonstrates how to calculate the tangent of an angle using a triangle, emphasizing the importance of understanding trigonometric functions beyond the unit circle.

What is the common understanding of cosine on the unit circle?

• It is the angle of a triangle.

• It is the hypotenuse of a triangle.

• It is the x-coordinate of a point.

• It is the y-coordinate of a point.

How can cosine inverse of 3/4 be represented?

• As a point on the unit circle.

• As a ratio of opposite over hypotenuse.

• As a ratio of adjacent over hypotenuse.

• As a ratio of opposite over adjacent.

Why is a calculator needed to evaluate cosine inverse of 3/4?

• Because it is a point on the unit circle.

• Because it is a common angle.

• Because it is not a special right triangle angle.

• Because it is a known trigonometric identity.

What is the length of the side 'a' in the triangle used to find the tangent?

• sqrt(7)

• 4

• 5

• 3

What should you do if a point is not on the unit circle?

• Assume the point is on the unit circle.

• Ignore the point.

• Create a triangle to find trigonometric values.

• Use a calculator to find the angle.