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Home > PC3 > Chapter 8 > Lesson 8.3.2 > Problem 8-99

8-99.
  1. Verify the following trigonometric identities. Homework Help ✎

    1. cot2(x)(sec2(x) – 1) = 1

    2. sin2(α ) – cos2(α ) = 1 – 2 cos2(α )

Substitute a Pythagorean Identity for sec2(x) − 1.

Substitute the Fundamental Pythagorean Identity into the left side of the equation for sin2(α).