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Home > A2C > Chapter 13 > Lesson 13.2.1 > Problem 13-95

13-95.
  1. Rewrite each of the following expressions in a simpler form. Homework Help ✎

    1. cos2(θ π) + sin2(θ π)

    2. cos2(2w) − sin2(2w)

Use the Pythagorean Identity:

cos2(x) + sin2(x) = 1

Use cos(2x) = cos2(x) − sin2(x)

Recall the meaning of tanθ.