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
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
Multiple Choice
Which graph best represents the function (inverse tangent)?
A
An increasing S-shaped curve passing through with horizontal asymptotes and .
B
A U-shaped parabola opening upward with vertex at and symmetry about the -axis.
C
A decreasing S-shaped curve passing through with horizontal asymptotes and .
D
A repeating curve with vertical asymptotes at and zeros at .
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Verified step by step guidance1
Recall that the function given is the inverse tangent function, denoted as \(y = \tan^{-1} x\), also called arctangent. This function returns the angle whose tangent is \(x\).
Understand the general shape of \(y = \tan^{-1} x\): it is an increasing function that passes through the origin \((0,0)\) because \(\tan^{-1}(0) = 0\).
Identify the horizontal asymptotes of the inverse tangent function. As \(x \to +\infty\), \(y\) approaches \(\frac{\pi}{2}\), and as \(x \to -\infty\), \(y\) approaches \(-\frac{\pi}{2}\). These are the horizontal asymptotes.
Note that the graph is S-shaped (sigmoid-like), increasing smoothly from \(-\frac{\pi}{2}\) to \(\frac{\pi}{2}\), crossing the origin, and never repeating or oscillating.
Compare these properties with the given options: the correct graph is the increasing S-shaped curve passing through \((0,0)\) with horizontal asymptotes at \(y = \frac{\pi}{2}\) and \(y = -\frac{\pi}{2}\).
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