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Home > A2C > Chapter 13 > Lesson 13.2.2 > Problem 13-118

  1. Prove that each of the following equations is an identity. In other words, prove that they are each true for all values for which the functions are defined. Homework Help ✎

sin2θ + cos2θ = 1

Recall the trigonometric ratios for sinθ, cosθ, and tanθ.

Substitute trigonometric ratios for tanθ and sec2θ.
(sinθ)(sin2θ + cos2θ)