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Ch. 6 - Inverse Circular Functions and Trigonometric Equations
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. 6 - Inverse Circular Functions and Trigonometric EquationsProblema 49
Capitolo 7, Problema 49

Use a calculator to approximate each value in decimal degrees.
θ = sin⁻¹ (-0.13349122)

Guida verificata passo dopo passo
1
Identify the problem: You need to find the angle \( \theta \) such that \( \sin(\theta) = -0.13349122 \), and express \( \theta \) in decimal degrees.
Recall the inverse sine function: \( \theta = \sin^{-1}(x) \) gives the angle whose sine is \( x \). The output of \( \sin^{-1} \) is usually in the range \( [-90^\circ, 90^\circ] \) when working in degrees.
Use a calculator set to degree mode to find the principal value: Input \( -0.13349122 \) into the inverse sine function \( \sin^{-1} \) to get the initial angle \( \theta_1 \).
Consider the sine function's symmetry: Since sine is negative, the angle \( \theta \) lies either in the third or fourth quadrant. The principal value from the calculator will be in the fourth quadrant (negative angle).
If needed, find the second possible angle by using the identity \( \theta_2 = 180^\circ - \theta_1 \) or by considering the unit circle, depending on the context of the problem.

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Inverse Sine Function (sin⁻¹ or arcsin)

The inverse sine function, denoted as sin⁻¹ or arcsin, returns the angle whose sine value is a given number. It is used to find an angle when the sine value is known, with the output typically restricted to the range of -90° to 90° (or -π/2 to π/2 radians).
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Inverse Sine

Domain and Range of the Sine and Inverse Sine Functions

The sine function outputs values between -1 and 1, so its inverse function only accepts inputs within this range. The inverse sine function’s output is limited to angles between -90° and 90°, ensuring a unique angle for each sine value.
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Inverse Sine

Using a Calculator to Find Decimal Degree Approximations

Calculators can compute inverse trigonometric functions and provide angle measures in degrees or radians. To approximate θ = sin⁻¹(-0.13349122), ensure the calculator is set to degree mode, input the value, and interpret the result as the angle in decimal degrees.
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4:45
How to Use a Calculator for Trig Functions
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