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Ch. 2 - Acute Angles and Right Triangles
Lial - Trigonometry 12th Edition
Lial12th EditionTrigonometryISBN: 9780136552161, 9780135440780, 9780136881117, 9780135440827, 9780135924891Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoLial 12th EditionCh. 2 - Acute Angles and Right TrianglesProblema 40
Capitolo 3, Problema 40

Find the exact value of each expression. See Example 3. tan(-1020°)

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Recognize that the tangent function has a period of 180°, meaning that \(\tan(\theta) = \tan(\theta + 180°k)\) for any integer \(k\). This allows us to reduce the angle to an equivalent angle between 0° and 180° (or between -90° and 90°) to simplify the calculation.
Start by adding or subtracting multiples of 180° to the angle \(-1020°\) to find a coterminal angle within the standard range. For example, add \(180° \times k\) where \(k\) is chosen so that the resulting angle lies between \(-180°\) and \$180°$.
Calculate the reduced angle: \(-1020° + 180° \times 6 = -1020° + 1080° = 60°\). So, \(\tan(-1020°) = \tan(60°)\).
Recall the exact value of \(\tan(60°)\) from the unit circle or special triangles. The tangent of 60° is \(\sqrt{3}\).
Therefore, the exact value of \(\tan(-1020°)\) is the same as \(\tan(60°)\), which is \(\sqrt{3}\).

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Angle Coterminality

Angles that differ by full rotations (multiples of 360°) share the same terminal side and thus have the same trigonometric values. To simplify an angle like -1020°, add or subtract 360° repeatedly until the angle lies within a standard range, typically 0° to 360° or -360° to 360°.
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Coterminal Angles

Tangent Function Periodicity

The tangent function has a period of 180°, meaning tan(θ) = tan(θ + 180°). This property allows further simplification of angles by reducing them modulo 180°, making it easier to find exact values for tangent expressions.
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Introduction to Tangent Graph

Exact Values of Tangent for Special Angles

Certain angles, such as 0°, 30°, 45°, 60°, and 90°, have known exact tangent values derived from the unit circle or special triangles. Recognizing these angles after simplification helps in determining the exact value of the tangent expression without a calculator.
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Example 1
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