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)
Table of contents
- 0. Review of College Algebra4h 45m
- 1. Measuring Angles40m
- 2. Trigonometric Functions on Right Triangles2h 5m
- 3. Unit Circle1h 19m
- 4. Graphing Trigonometric Functions1h 19m
- 5. Inverse Trigonometric Functions and Basic Trigonometric Equations1h 41m
- 6. Trigonometric Identities and More Equations2h 34m
- 7. Non-Right Triangles1h 38m
- 8. Vectors2h 25m
- 9. Polar Equations2h 5m
- 10. Parametric Equations1h 6m
- 11. Graphing Complex Numbers1h 7m
5. Inverse Trigonometric Functions and Basic Trigonometric Equations
Inverse Sine, Cosine, & Tangent
Problem 105
Textbook Question
The graphs of y = sin⁻¹ x, y = cos⁻¹ x, and y = tan⁻¹ x are shown in Table 2.8. In Exercises 97–106, use transformations (vertical shifts, horizontal shifts, reflections, stretching, or shrinking) of these graphs to graph each function. Then use interval notation to give the function's domain and range. f(x) = cos⁻¹ x/2
Verified step by step guidance1
Identify the base function given, which is the inverse cosine function \(y = \cos^{-1} x\). This function has a domain of \([-1, 1]\) and a range of \([0, \pi]\).
Recognize that the function provided is \(f(x) = \cos^{-1} \left( \frac{x}{2} \right)\), which means the input to the inverse cosine function is transformed by dividing \(x\) by 2.
Determine the domain of \(f(x)\) by setting the inside of the inverse cosine function within its valid domain: \(-1 \leq \frac{x}{2} \leq 1\). Solve this inequality for \(x\) to find the domain of \(f(x)\).
Understand that the range of \(f(x)\) remains the same as the range of \(\cos^{-1} x\), because the transformation is inside the function and does not affect the output values. So, the range is \([0, \pi]\).
To graph \(f(x)\), start with the graph of \(y = \cos^{-1} x\) and apply a horizontal stretch by a factor of 2 (since \(x\) is divided by 2 inside the function). This means the graph will be stretched horizontally, making it wider.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Inverse Trigonometric Functions
Inverse trigonometric functions, such as sin⁻¹x, cos⁻¹x, and tan⁻¹x, return the angle whose trigonometric ratio equals x. They have specific domains and ranges to ensure they are functions, typically restricted to principal values. Understanding these functions is essential for graphing and analyzing their transformations.
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Function Transformations
Function transformations include vertical and horizontal shifts, reflections, stretches, and shrinks. These changes alter the graph's position or shape without changing its fundamental nature. For example, replacing x by x/2 horizontally stretches the graph, affecting the domain and range accordingly.
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Domain and Range of Function Transformations
Domain and Range of Transformed Functions
The domain is the set of input values for which the function is defined, and the range is the set of possible output values. When a function undergoes transformations, its domain and range may change. Using interval notation helps clearly express these sets after applying transformations.
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