Domanda del libro di testo
In Exercises 9–16, use the given triangles to evaluate each expression. If necessary, express the value without a square root in the denominator by rationalizing the denominator.
sin 𝜋/4 - cos 𝜋/4
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Ch. 1 - Angles and the Trigonometric Functions
Blitzer3rd EditionTrigonometryISBN: 9780137316601
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TOC.tableOfContents
Capitolo 1, Problema 14
In Exercises 5–18, the unit circle has been divided into twelve equal arcs, corresponding to t-values of
0, 𝜋, 𝜋, 𝜋, 2𝜋, 5𝜋, 𝜋, 7𝜋, 4𝜋, 3𝜋, 5𝜋, 11𝜋, and 2𝜋.
6 3 2 3 6 6 3 2 3 6
Use the (x,y) coordinates in the figure to find the value of each trigonometric function at the indicated real number, t, or state that the expression is undefined.
In Exercises 11–18, continue to refer to the figure at the bottom of the previous page.
sec 5𝜋/3
Guida verificata passo dopo passo1
Identify the angle \( \frac{5\pi}{3} \) on the unit circle.
Locate the corresponding point on the unit circle for \( \frac{5\pi}{3} \), which is \( \left( \frac{1}{2}, -\frac{\sqrt{3}}{2} \right) \).
Recall that the secant function, \( \sec(\theta) \), is the reciprocal of the cosine function, \( \cos(\theta) \).
Determine the cosine of \( \frac{5\pi}{3} \) using the x-coordinate of the point, which is \( \frac{1}{2} \).
Calculate \( \sec(\frac{5\pi}{3}) = \frac{1}{\cos(\frac{5\pi}{3})} = \frac{1}{\frac{1}{2}} \).
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Unit Circle
The unit circle is a circle with a radius of one centered at the origin of a coordinate plane. It is fundamental in trigonometry as it provides a geometric representation of the sine, cosine, and tangent functions. The coordinates of points on the unit circle correspond to the cosine and sine values of angles measured in radians, allowing for easy calculation of trigonometric functions.
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Percorso guidato
06:11
Introduction to the Unit Circle
Trigonometric Functions
Trigonometric functions, including sine, cosine, tangent, secant, cosecant, and cotangent, relate the angles of a triangle to the lengths of its sides. In the context of the unit circle, these functions can be defined using the coordinates of points on the circle. For example, the secant function is the reciprocal of the cosine function, which can be derived from the x-coordinate of a point on the unit circle.
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Percorso guidato
6:04Introduction to Trigonometric Functions
Radians and Angle Measurement
Radians are a unit of angular measure used in mathematics, where one radian is the angle subtended at the center of a circle by an arc equal in length to the radius of the circle. The unit circle divides the circle into angles measured in radians, which are essential for defining trigonometric functions. Understanding how to convert between degrees and radians is crucial for solving problems involving trigonometric functions.
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5:04Converting between Degrees & Radians
Pratica correlata
Domanda del libro di testo
In Exercises 5–18, the unit circle has been divided into twelve equal arcs, corresponding to t-values of
0, 𝜋, 𝜋, 𝜋, 2𝜋, 5𝜋, 𝜋, 7𝜋, 4𝜋, 3𝜋, 5𝜋, 11𝜋, and 2𝜋.
6 3 2 3 6 6 3 2 3 6
Use the (x,y) coordinates in the figure to find the value of each trigonometric function at the indicated real number, t, or state that the expression is undefined.
<IMAGE>
In Exercises 11–18, continue to refer to the figure at the bottom of the previous page.
sec 11𝜋/6
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Domanda del libro di testo
In Exercises 13–17, find a positive angle less than 360° or 2𝜋 that is coterminal with the given angle. -445°
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Domanda del libro di testo
Use the given triangles to evaluate each expression. If necessary, express the value without a square root in the denominator by rationalizing the denominator.
<IMAGE>
tan 𝜋/3
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Domanda del libro di testo
In Exercises 5–18, the unit circle has been divided into twelve equal arcs, corresponding to t-values of 0, 𝜋, 𝜋, 𝜋, 2𝜋, 5𝜋, 𝜋, 7𝜋, 4𝜋, 3𝜋, 5𝜋, 11𝜋, and 2𝜋. 6 3 2 3 6 6 3 2 3 6 Use the (x,y) coordinates in the figure to find the value of each trigonometric function at the indicated real number, t, or state that the expression is undefined.
In Exercises 11–18, continue to refer to the figure at the bottom of the previous page. csc 4𝜋/3
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Domanda del libro di testo
The unit circle has been divided into twelve equal arcs, corresponding to t-values of
0, 𝜋/6, 𝜋/3, 𝜋/2, 2𝜋/3, 5𝜋/6, 𝜋, 7𝜋/6, 4𝜋/3, 3𝜋/2, 5𝜋/3, 11𝜋/6, and 2𝜋
Use the (x,y) coordinates in the figure to find the value of each trigonometric function at the indicated real number, t, or state that the expression is undefined.
<IMAGE>
sin 3𝜋/2
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