### Home > PC > Chapter 6 > Lesson 6.2.3 > Problem 6-95

6-95.

Suppose is an angle in Quadrant I and

*is an angle in Quadrant IV such that*

Find the exact value of

. Draw diagrams. Find the 3rd side for each triangle.

Find the exact value of . Draw diagrams. Find the 3rd side for each triangle.

Find the exact value of

. Use the angle sum and difference formula for the sine.

Find the exact value of

. Use the angle sum and difference formula for the cosine.

Use your calculator to approximate your answer to part (d).