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Home > PC > Chapter 11 > Lesson 11.2.1 > Problem 11-75

11-75.
  1. Simplify the following expressions into a single trigonometric function. Homework Help ✎

    1. cosacosb − sinasinb

    2. 20 sin(3x) cos(3x)

    3. sin(3x) cos(x) − cos(3x) sin(x)

    4. sin2(4y) − cos2(4y)

Use the Angle Sum and Difference Identities.

This expression is equivalent to −[cos(4y)cos(4y) − sin(4y)sin(4y)].