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. sin (tan⁻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 99
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 + 1)
Verified step by step guidance1
Identify the base function: here, the base function is the inverse cosine function, written as \(y = \cos^{-1} x\).
Recognize the transformation inside the function: the function is \(f(x) = \cos^{-1} (x + 1)\), which means the input to the inverse cosine is shifted horizontally by -1 (to the left by 1 unit).
Determine the domain of the transformed function by considering the domain of the original \(\cos^{-1} x\), which is \([-1, 1]\). Since the input is \(x + 1\), set \(-1 \leq x + 1 \leq 1\) and solve for \(x\) to find the new domain.
Recall that the range of \(\cos^{-1} x\) is \([0, \pi]\). Since the transformation is only horizontal (inside the function), the range remains unchanged.
Summarize the domain and range in interval notation based on the calculations and transformations applied.
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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 like cos⁻¹(x) return the angle whose cosine is x. They have specific domains and ranges, for example, cos⁻¹(x) is defined for x in [-1,1] with range [0, π]. Understanding these functions is essential to interpret and graph transformations correctly.
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Introduction to Inverse Trig Functions
Graph Transformations
Graph transformations include shifts, reflections, stretches, and shrinks applied to a base graph. For f(x) = cos⁻¹(x + 1), the '+1' inside the function causes a horizontal shift left by 1 unit. Recognizing how these transformations affect the graph helps in sketching and determining domain and range.
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Introduction to Transformations
Domain and Range of Transformed Functions
The domain and range of a function can change after transformations. For cos⁻¹(x + 1), the domain shifts accordingly, affecting the input values allowed. Using interval notation to express these sets precisely is crucial for fully describing the function's behavior.
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Domain and Range of Function Transformations
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