7 Trigonometric Identities and Equations 681 Electricity that passes through wires to homes and businesses alternates its direction on those wires and is modeled by sine and cosine functions. 7.1 Fundamental Identities 7.2 Verifying Trigonometric Identities 7.3 Sum and Difference Identities Chapter 7 Quiz 7.4 Double-Angle and Half-Angle Identities Summary Exercises on Verifying Trigonometric Identities 7.5 Inverse Circular Functions 7.6 Trigonometric Equations Chapter 7 Quiz 7.7 Equations Involving Inverse Trigonometric Functions
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