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$$- \frac{x \left(\frac{x^{2}}{- x^{2} + 1} + 1\right) \left(\frac{2}{x^{2} - 1} + \frac{3}{- x^{2} + 1}\right)}{\sqrt{- x^{2} + 1} \left(\frac{x^{2}}{x^{2} - 1} - 1\right)} = 0$$
Solve this equationThe roots of this equation
$$x_{1} = 0$$
You also need to calculate the limits of y '' for arguments seeking to indeterminate points of a function:
Points where there is an indetermination:
$$x_{1} = -1$$
$$x_{2} = 1$$
$$\lim_{x \to -1^-}\left(- \frac{x \left(\frac{x^{2}}{- x^{2} + 1} + 1\right) \left(\frac{2}{x^{2} - 1} + \frac{3}{- x^{2} + 1}\right)}{\sqrt{- x^{2} + 1} \left(\frac{x^{2}}{x^{2} - 1} - 1\right)}\right) = - \infty i$$
Let's take the limit$$\lim_{x \to -1^+}\left(- \frac{x \left(\frac{x^{2}}{- x^{2} + 1} + 1\right) \left(\frac{2}{x^{2} - 1} + \frac{3}{- x^{2} + 1}\right)}{\sqrt{- x^{2} + 1} \left(\frac{x^{2}}{x^{2} - 1} - 1\right)}\right) = -\infty$$
Let's take the limit- the limits are not equal, so
$$x_{1} = -1$$
- is an inflection point
$$\lim_{x \to 1^-}\left(- \frac{x \left(\frac{x^{2}}{- x^{2} + 1} + 1\right) \left(\frac{2}{x^{2} - 1} + \frac{3}{- x^{2} + 1}\right)}{\sqrt{- x^{2} + 1} \left(\frac{x^{2}}{x^{2} - 1} - 1\right)}\right) = \infty$$
Let's take the limit$$\lim_{x \to 1^+}\left(- \frac{x \left(\frac{x^{2}}{- x^{2} + 1} + 1\right) \left(\frac{2}{x^{2} - 1} + \frac{3}{- x^{2} + 1}\right)}{\sqrt{- x^{2} + 1} \left(\frac{x^{2}}{x^{2} - 1} - 1\right)}\right) = \infty i$$
Let's take the limit- the limits are not equal, so
$$x_{2} = 1$$
- is an inflection point
Сonvexity and concavity intervals:Let’s find the intervals where the function is convex or concave, for this look at the behaviour of the function at the inflection points:
Concave at the intervals
$$\left[0, \infty\right)$$
Convex at the intervals
$$\left(-\infty, 0\right]$$