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Home > PC3 > Chapter 12 > Lesson 12.2.1 > Problem 12-99

12-99.

Given and where , , determine the exact value of each of the following trigonometric expressions.

Draw a diagram of the two triangles. Use the Pythagorean Theorem to determine the length of the missing side.

  1. Use the angle sum formula for sine:

  1. Use the angle sum formula for cosine: