Mister Exam

Graphing y = abs(1/ctg(x))

v

The graph:

from to

Intersection points:

does show?

Piecewise:

The solution

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       |    1   |
f(x) = |1*------|
       |  cot(x)|
$$f{\left(x \right)} = \left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right|$$
f = Abs(1/cot(x))
The graph of the function
The domain of the function
The points at which the function is not precisely defined:
$$x_{1} = 1.5707963267949$$
The points of intersection with the X-axis coordinate
Graph of the function intersects the axis X at f = 0
so we need to solve the equation:
$$\left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right| = 0$$
Solve this equation
The points of intersection with the axis X:

Numerical solution
$$x_{1} = 69.1150383789755$$
$$x_{2} = -50.2654824574367$$
$$x_{3} = -25.1327412287183$$
$$x_{4} = 87.9645943005142$$
$$x_{5} = -59.6902604182061$$
$$x_{6} = 97.3893722612836$$
$$x_{7} = -81.6814089933346$$
$$x_{8} = -21.9911485751286$$
$$x_{9} = 62.8318530717959$$
$$x_{10} = -69.1150383789755$$
$$x_{11} = 81.6814089933346$$
$$x_{12} = -56.5486677646163$$
$$x_{13} = 37.6991118430775$$
$$x_{14} = 25.1327412287183$$
$$x_{15} = -78.5398163397448$$
$$x_{16} = -62.8318530717959$$
$$x_{17} = -65.9734457253857$$
$$x_{18} = -87.9645943005142$$
$$x_{19} = -53.4070751110265$$
$$x_{20} = 21.9911485751286$$
$$x_{21} = -47.1238898038469$$
$$x_{22} = -100.530964914873$$
$$x_{23} = 6.28318530717959$$
$$x_{24} = -75.398223686155$$
$$x_{25} = -72.2566310325652$$
$$x_{26} = 9.42477796076938$$
$$x_{27} = 56.5486677646163$$
$$x_{28} = 65.9734457253857$$
$$x_{29} = 100.530964914873$$
$$x_{30} = -28.2743338823081$$
$$x_{31} = 43.9822971502571$$
$$x_{32} = -6.28318530717959$$
$$x_{33} = 31.4159265358979$$
$$x_{34} = -3.14159265358979$$
$$x_{35} = 28.2743338823081$$
$$x_{36} = -37.6991118430775$$
$$x_{37} = -84.8230016469244$$
$$x_{38} = 84.8230016469244$$
$$x_{39} = -34.5575191894877$$
$$x_{40} = -91.106186954104$$
$$x_{41} = 15.707963267949$$
$$x_{42} = 94.2477796076938$$
$$x_{43} = 75.398223686155$$
$$x_{44} = 34.5575191894877$$
$$x_{45} = 91.106186954104$$
$$x_{46} = -18.8495559215388$$
$$x_{47} = -12.5663706143592$$
$$x_{48} = -15.707963267949$$
$$x_{49} = 59.6902604182061$$
$$x_{50} = -94.2477796076938$$
$$x_{51} = 47.1238898038469$$
$$x_{52} = -43.9822971502571$$
$$x_{53} = -9.42477796076938$$
$$x_{54} = 3.14159265358979$$
$$x_{55} = 40.8407044966673$$
$$x_{56} = -40.8407044966673$$
$$x_{57} = 72.2566310325652$$
$$x_{58} = 53.4070751110265$$
$$x_{59} = 78.5398163397448$$
$$x_{60} = 50.2654824574367$$
$$x_{61} = -97.3893722612836$$
$$x_{62} = 12.5663706143592$$
$$x_{63} = -31.4159265358979$$
$$x_{64} = 18.8495559215388$$
The points of intersection with the Y axis coordinate
The graph crosses Y axis when x equals 0:
substitute x = 0 to Abs(1/cot(x)).
$$\left|{1 \cdot \frac{1}{\cot{\left(0 \right)}}}\right|$$
The result:
$$f{\left(0 \right)} = 0$$
The point:
(0, 0)
Extrema of the function
In order to find the extrema, we need to solve the equation
$$\frac{d}{d x} f{\left(x \right)} = 0$$
(the derivative equals zero),
and the roots of this equation are the extrema of this function:
$$\frac{d}{d x} f{\left(x \right)} = $$
the first derivative
$$\frac{\cot^{2}{\left(x \right)} + 1}{\cot^{2}{\left(x \right)} \operatorname{sign}{\left(\cot{\left(x \right)} \right)}} = 0$$
Solve this equation
Solutions are not found,
function may have no extrema
Inflection points
Let's find the inflection points, we'll need to solve the equation for this
$$\frac{d^{2}}{d x^{2}} f{\left(x \right)} = 0$$
(the second derivative equals zero),
the roots of this equation will be the inflection points for the specified function graph:
$$\frac{d^{2}}{d x^{2}} f{\left(x \right)} = $$
the second derivative
$$\frac{2 \left(\cot^{2}{\left(x \right)} + 1\right) \left(\frac{\left(\cot^{2}{\left(x \right)} + 1\right) \delta\left(\cot{\left(x \right)}\right)}{\cot{\left(x \right)} \operatorname{sign}{\left(\cot{\left(x \right)} \right)}} + \frac{\cot^{2}{\left(x \right)} + 1}{\cot^{2}{\left(x \right)}} - 1\right)}{\cot{\left(x \right)} \operatorname{sign}{\left(\cot{\left(x \right)} \right)}} = 0$$
Solve this equation
Solutions are not found,
maybe, the function has no inflections
Vertical asymptotes
Have:
$$x_{1} = 1.5707963267949$$
Horizontal asymptotes
Let’s find horizontal asymptotes with help of the limits of this function at x->+oo and x->-oo
$$\lim_{x \to -\infty} \left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right| = \lim_{x \to -\infty} \left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right|$$
Let's take the limit
so,
equation of the horizontal asymptote on the left:
$$y = \lim_{x \to -\infty} \left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right|$$
$$\lim_{x \to \infty} \left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right| = \lim_{x \to \infty} \left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right|$$
Let's take the limit
so,
equation of the horizontal asymptote on the right:
$$y = \lim_{x \to \infty} \left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right|$$
Inclined asymptotes
Inclined asymptote can be found by calculating the limit of Abs(1/cot(x)), divided by x at x->+oo and x ->-oo
$$\lim_{x \to -\infty}\left(\frac{\left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right|}{x}\right) = \lim_{x \to -\infty}\left(\frac{\left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right|}{x}\right)$$
Let's take the limit
so,
inclined asymptote equation on the left:
$$y = x \lim_{x \to -\infty}\left(\frac{\left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right|}{x}\right)$$
$$\lim_{x \to \infty}\left(\frac{\left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right|}{x}\right) = \lim_{x \to \infty}\left(\frac{\left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right|}{x}\right)$$
Let's take the limit
so,
inclined asymptote equation on the right:
$$y = x \lim_{x \to \infty}\left(\frac{\left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right|}{x}\right)$$
Even and odd functions
Let's check, whether the function even or odd by using relations f = f(-x) и f = -f(-x).
So, check:
$$\left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right| = \frac{1}{\left|{\cot{\left(x \right)}}\right|}$$
- No
$$\left|{1 \cdot \frac{1}{\cot{\left(x \right)}}}\right| = - \frac{1}{\left|{\cot{\left(x \right)}}\right|}$$
- No
so, the function
not is
neither even, nor odd
The graph
Graphing y = abs(1/ctg(x))