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Ch. 2 - Graphs of the Trigonometric Functions; Inverse Trigonometric Functions
Blitzer - Trigonometry 3rd Edition
Blitzer3rd EditionTrigonometryISBN: 9780137316601Non è quello che usi tu?Cambia libro di testo
Capitolo 2, Problema 94

In Exercises 83–94, use a right triangle to write each expression as an algebraic expression. Assume that x is positive and that the given inverse trigonometric function is defined for the expression in x. csc (cot⁻¹ x)

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Recognize that the expression is \( \csc(\cot^{-1} x) \). Let \( \theta = \cot^{-1} x \), which means \( \cot \theta = x \).
Recall that \( \cot \theta = \frac{\text{adjacent}}{\text{opposite}} \). Since \( x > 0 \), we can represent the right triangle with adjacent side = \( x \) and opposite side = 1.
Use the Pythagorean theorem to find the hypotenuse: \( \text{hypotenuse} = \sqrt{x^2 + 1^2} = \sqrt{x^2 + 1} \).
Recall that \( \csc \theta = \frac{\text{hypotenuse}}{\text{opposite}} \). Substitute the values from the triangle: \( \csc \theta = \frac{\sqrt{x^2 + 1}}{1} \).
Therefore, \( \csc(\cot^{-1} x) = \sqrt{x^2 + 1} \), which is the algebraic expression in terms of \( x \).

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Inverse Trigonometric Functions

Inverse trigonometric functions, like cot⁻¹(x), return an angle whose trigonometric ratio equals x. Understanding how to interpret these functions is essential for converting expressions involving inverse trig functions into geometric or algebraic forms.
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Right Triangle Definitions of Trigonometric Ratios

Trigonometric ratios such as sine, cosine, cotangent, and cosecant can be represented as ratios of sides in a right triangle. Using a right triangle helps visualize and rewrite expressions like csc(cot⁻¹ x) in terms of side lengths and algebraic expressions.
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Relationship Between Cotangent and Cosecant

Cotangent is the ratio of adjacent to opposite sides, while cosecant is the reciprocal of sine (hypotenuse over opposite). Understanding how to express csc(θ) when θ = cot⁻¹(x) involves using the Pythagorean theorem to find the hypotenuse and then forming the correct ratio.
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