Difference between revisions of "Graphs of the Tangent, Cotangent, Cosecant and Secant Functions"
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<math>\sec x = \frac{1}{\cos x}</math> | <math>\sec x = \frac{1}{\cos x}</math> | ||
− | The range of <math> \cos{x} </math> is <math> [-1, 1] </math>, so the range of <math> \sec{x} </math> is <math> (-\infty , -1] \cup [1, \infty ) </math>, which is all possible outputs of 1/x for <math> -1\leq x\ | + | The range of <math> \cos{x} </math> is <math> [-1, 1] </math>, so the range of <math> \sec{x} </math> is <math> (-\infty , -1] \cup [1, \infty ) </math>, which is all possible outputs of 1/x for <math> -1\leq x\leq 1 </math>. Since <math> \frac{1}{0} </math> is not defined, <math>\sec{x}</math> is not defined whenever <math>\cos{x} = 0</math>; that is, when <math> x = \pi k + \frac{\pi}{2} </math> for any integer k. We can see that there is a vertical asymptote at each of these values in the graph of <math>y = \sec{x}</math>. |
=== Cosecant === | === Cosecant === | ||
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The '''cosecant''' of an angle is the reciprocal of its sine. | The '''cosecant''' of an angle is the reciprocal of its sine. | ||
− | <math>\ | + | <math>\csc{x} = \frac{1}{\sin{x}}</math> |
− | <math>\csc{x}</math> is not defined whenever <math>\sin{x} = 0</math>; that is, when <math> x = \pi k </math> for any integer k. We can see that there is a vertical asymptote at each of these values in the graph of <math>y = \csc{x}</math>. | + | The range of <math>\csc{x}</math> is the same as the range for <math>\sec{x}</math> (<math> (-\infty , -1] \cup [1, \infty ) </math>). <math>\csc{x}</math> is not defined whenever <math>\sin{x} = 0</math>; that is, when <math> x = \pi k </math> for any integer k. We can see that there is a vertical asymptote at each of these values in the graph of <math>y = \csc{x}</math>. |
=== Cotangent === | === Cotangent === |
Revision as of 16:17, 5 October 2021
Secant, Cosecant, and Cotangent
Secant
The secant of an angle is the reciprocal of its cosine.
The range of is , so the range of is , which is all possible outputs of 1/x for . Since is not defined, is not defined whenever ; that is, when for any integer k. We can see that there is a vertical asymptote at each of these values in the graph of .
Cosecant
The cosecant of an angle is the reciprocal of its sine.
The range of is the same as the range for (). is not defined whenever ; that is, when for any integer k. We can see that there is a vertical asymptote at each of these values in the graph of .
Cotangent
The cotangent of an angle is the reciprocal of its tangent.
Resources
- Graphs of the Tangent, Cotangent, Cosecant and Secant Functions. Written notes created by Professor Esparza, UTSA.