Domanda del libro di testo
In Exercises 31–34, determine the amplitude of each function. Then graph the function and y = cos x in the same rectangular coordinate system for 0 ≤ x ≤ 2π. y = 2 cos x
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Ch. 2 - Graphs of the Trigonometric Functions; Inverse Trigonometric Functions
Blitzer3rd EditionTrigonometryISBN: 9780137316601
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Blitzer 3rd EditionCh. 2 - Graphs of the Trigonometric Functions; Inverse Trigonometric FunctionsProblema 31
Blitzer 3rd EditionCh. 2 - Graphs of the Trigonometric Functions; Inverse Trigonometric FunctionsProblema 31Capitolo 2, Problema 31
In Exercises 29–36, find the length x to the nearest whole unit.
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Identify the two right triangles in the diagram. The larger triangle has a base of 1600 units and an unknown height x. The angles given are 66° and 24°, which are complementary to the right angle in each triangle.
Use the tangent function, which relates the opposite side to the adjacent side in a right triangle. For the larger triangle with angle 66°, write the equation: \(\tan(66^\circ) = \frac{x}{1600}\).
Solve for x in the equation from step 2: \(x = 1600 \times \tan(66^\circ)\).
For the smaller triangle, note that the height is the difference between the two heights formed by the two triangles. Use the tangent function for the 24° angle: \(\tan(24^\circ) = \frac{h}{1600}\), where h is the height of the smaller triangle.
Calculate the height h from the smaller triangle: \(h = 1600 \times \tan(24^\circ)\). Then, subtract h from the height x of the larger triangle to find the length of the segment labeled x in the diagram.
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Right Triangle Trigonometry
Right triangle trigonometry involves relationships between the angles and sides of a right triangle. The primary trigonometric ratios—sine, cosine, and tangent—relate an angle to the ratios of two sides. These ratios are essential for finding unknown side lengths or angles when some measurements are known.
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Percorso guidato
04:39
45-45-90 Triangles
Angle Sum Property of Triangles
The angle sum property states that the sum of the interior angles of any triangle is 180°. In this problem, knowing two angles (66° and 24°) helps confirm the triangle's structure and can assist in identifying complementary or supplementary angles needed for calculations.
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Percorso guidato
4:47Sum and Difference of Tangent
Using Trigonometric Ratios to Find Lengths
To find an unknown side length like x, use trigonometric ratios with the given angles and known side lengths. For example, tangent relates the opposite side to the adjacent side, allowing calculation of height x when the base and angle are known. This approach is key to solving the problem.
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Percorso guidato
4:18Finding Missing Side Lengths
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