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In Exercises 35–60, find the reference angle for each angle. - 11𝜋 / 4
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Ch. 1 - Angles and the Trigonometric Functions
Blitzer3rd EditionTrigonometryISBN: 9780137316601
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Capitolo 1, Problema 1
In Exercises 1–8, a point on the terminal side of angle θ is given. Find the exact value of each of the six trigonometric functions of θ. (-4, 3)
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Identify the coordinates of the point on the terminal side of angle \( \theta \). Here, the point is \((-4, 3)\), so \(x = -4\) and \(y = 3\).
Calculate the radius \(r\), which is the distance from the origin to the point, using the formula \(r = \sqrt{x^2 + y^2}\). Substitute the values to get \(r = \sqrt{(-4)^2 + 3^2}\).
Recall the definitions of the six trigonometric functions in terms of \(x\), \(y\), and \(r\):
\[ \sin \theta = \frac{y}{r}, \quad \cos \theta = \frac{x}{r}, \quad \tan \theta = \frac{y}{x} \]
\[ \csc \theta = \frac{r}{y}, \quad \sec \theta = \frac{r}{x}, \quad \cot \theta = \frac{x}{y} \]
Substitute the values of \(x\), \(y\), and \(r\) into each of the six functions to express them exactly in terms of radicals and integers.
Consider the signs of the trigonometric functions based on the quadrant where the point \((-4, 3)\) lies. Since \(x < 0\) and \(y > 0\), the point is in the second quadrant, which affects the signs of sine, cosine, and tangent.
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Coordinates and the Terminal Side of an Angle
The terminal side of an angle θ in standard position passes through a point (x, y). This point's coordinates help determine the angle's trigonometric values by relating x and y to the radius (r), which is the distance from the origin to the point.
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Percorso guidato
05:32
Intro to Polar Coordinates
Radius (r) and the Distance Formula
The radius r is the distance from the origin to the point (x, y) on the terminal side, calculated using the distance formula r = √(x² + y²). This value is essential for normalizing the coordinates to find sine, cosine, and other trigonometric functions.
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6:36Quadratic Formula
Definition of the Six Trigonometric Functions
The six trigonometric functions—sine, cosine, tangent, cosecant, secant, and cotangent—are defined using x, y, and r: sin θ = y/r, cos θ = x/r, tan θ = y/x, and their reciprocals. Knowing these definitions allows calculation of exact values from the given point.
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6:04Introduction to Trigonometric Functions
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