Mister Exam
Graphing y = -x^2/2tgx*ctgx
The solution
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2
-x
f(x) = ----*tan(x)*cot(x)
2
$$f{\left(x \right)} = \frac{\left(-1\right) x^{2}}{2} \tan{\left(x \right)} \cot{\left(x \right)}$$
f = (((-x^2)/2)*tan(x))*cot(x)
The graph of the function
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:
$$\frac{\left(-1\right) x^{2}}{2} \tan{\left(x \right)} \cot{\left(x \right)} = 0$$
Solve this equation
Solution is not found,
it's possible that the graph doesn't intersect the axis X
so we need to solve the equation:
$$\frac{\left(-1\right) x^{2}}{2} \tan{\left(x \right)} \cot{\left(x \right)} = 0$$
Solve this equation
Solution is not found,
it's possible that the graph doesn't intersect the axis X
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
$$- \frac{x^{2} \left(- \cot^{2}{\left(x \right)} - 1\right) \tan{\left(x \right)}}{2} + \left(- \frac{x^{2} \left(\tan^{2}{\left(x \right)} + 1\right)}{2} - x \tan{\left(x \right)}\right) \cot{\left(x \right)} = 0$$
Solve this equation
Solutions are not found,
function may have no extrema
$$\frac{d}{d x} f{\left(x \right)} = 0$$
(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
$$- \frac{x^{2} \left(- \cot^{2}{\left(x \right)} - 1\right) \tan{\left(x \right)}}{2} + \left(- \frac{x^{2} \left(\tan^{2}{\left(x \right)} + 1\right)}{2} - x \tan{\left(x \right)}\right) \cot{\left(x \right)} = 0$$
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
$$- x^{2} \left(\cot^{2}{\left(x \right)} + 1\right) \tan{\left(x \right)} \cot{\left(x \right)} + x \left(x \left(\tan^{2}{\left(x \right)} + 1\right) + 2 \tan{\left(x \right)}\right) \left(\cot^{2}{\left(x \right)} + 1\right) - \left(x^{2} \left(\tan^{2}{\left(x \right)} + 1\right) \tan{\left(x \right)} + 2 x \left(\tan^{2}{\left(x \right)} + 1\right) + \tan{\left(x \right)}\right) \cot{\left(x \right)} = 0$$
Solve this equation
Solutions are not found,
maybe, the function has no inflections
$$\frac{d^{2}}{d x^{2}} f{\left(x \right)} = 0$$
(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
$$- x^{2} \left(\cot^{2}{\left(x \right)} + 1\right) \tan{\left(x \right)} \cot{\left(x \right)} + x \left(x \left(\tan^{2}{\left(x \right)} + 1\right) + 2 \tan{\left(x \right)}\right) \left(\cot^{2}{\left(x \right)} + 1\right) - \left(x^{2} \left(\tan^{2}{\left(x \right)} + 1\right) \tan{\left(x \right)} + 2 x \left(\tan^{2}{\left(x \right)} + 1\right) + \tan{\left(x \right)}\right) \cot{\left(x \right)} = 0$$
Solve this equation
Solutions are not found,
maybe, the function has no inflections
Horizontal asymptotes
Let’s find horizontal asymptotes with help of the limits of this function at x->+oo and x->-oo
Let's take the limit
so,
equation of the horizontal asymptote on the left:
$$y = \lim_{x \to -\infty}\left(\frac{\left(-1\right) x^{2}}{2} \tan{\left(x \right)} \cot{\left(x \right)}\right)$$
Let's take the limit
so,
equation of the horizontal asymptote on the right:
$$y = \lim_{x \to \infty}\left(\frac{\left(-1\right) x^{2}}{2} \tan{\left(x \right)} \cot{\left(x \right)}\right)$$
True
Let's take the limit
so,
equation of the horizontal asymptote on the left:
$$y = \lim_{x \to -\infty}\left(\frac{\left(-1\right) x^{2}}{2} \tan{\left(x \right)} \cot{\left(x \right)}\right)$$
True
Let's take the limit
so,
equation of the horizontal asymptote on the right:
$$y = \lim_{x \to \infty}\left(\frac{\left(-1\right) x^{2}}{2} \tan{\left(x \right)} \cot{\left(x \right)}\right)$$
Inclined asymptotes
Inclined asymptote can be found by calculating the limit of (((-x^2)/2)*tan(x))*cot(x), divided by x at x->+oo and x ->-oo
Let's take the limit
so,
inclined asymptote equation on the left:
$$y = x \lim_{x \to -\infty}\left(- \frac{x \tan{\left(x \right)} \cot{\left(x \right)}}{2}\right)$$
Let's take the limit
so,
inclined asymptote equation on the right:
$$y = x \lim_{x \to \infty}\left(- \frac{x \tan{\left(x \right)} \cot{\left(x \right)}}{2}\right)$$
True
Let's take the limit
so,
inclined asymptote equation on the left:
$$y = x \lim_{x \to -\infty}\left(- \frac{x \tan{\left(x \right)} \cot{\left(x \right)}}{2}\right)$$
True
Let's take the limit
so,
inclined asymptote equation on the right:
$$y = x \lim_{x \to \infty}\left(- \frac{x \tan{\left(x \right)} \cot{\left(x \right)}}{2}\right)$$
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:
$$\frac{\left(-1\right) x^{2}}{2} \tan{\left(x \right)} \cot{\left(x \right)} = - \frac{x^{2} \tan{\left(x \right)} \cot{\left(x \right)}}{2}$$
- No
$$\frac{\left(-1\right) x^{2}}{2} \tan{\left(x \right)} \cot{\left(x \right)} = \frac{x^{2} \tan{\left(x \right)} \cot{\left(x \right)}}{2}$$
- No
so, the function
not is
neither even, nor odd
So, check:
$$\frac{\left(-1\right) x^{2}}{2} \tan{\left(x \right)} \cot{\left(x \right)} = - \frac{x^{2} \tan{\left(x \right)} \cot{\left(x \right)}}{2}$$
- No
$$\frac{\left(-1\right) x^{2}}{2} \tan{\left(x \right)} \cot{\left(x \right)} = \frac{x^{2} \tan{\left(x \right)} \cot{\left(x \right)}}{2}$$
- No
so, the function
not is
neither even, nor odd