Para hallar los extremos hay que resolver la ecuación
$$\frac{d}{d x} f{\left(x \right)} = 0$$
(la derivada es igual a cero),
y las raíces de esta ecuación serán los extremos de esta función:
$$\frac{d}{d x} f{\left(x \right)} = $$
primera derivada$$\frac{\left(\frac{\left(\frac{\left(- \frac{2 \sin{\left(\frac{\operatorname{atan_{2}}{\left(0,1 - x^{2} \right)}}{2} \right)} \operatorname{im}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)} \operatorname{sign}{\left(x \right)}}{\sqrt{\frac{x^{2} - 1}{\operatorname{sign}{\left(x^{2} - 1 \right)}}}} + \frac{2 \cos{\left(\frac{\operatorname{atan_{2}}{\left(0,1 - x^{2} \right)}}{2} \right)} \operatorname{re}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)} \operatorname{sign}{\left(x \right)}}{\sqrt{\frac{x^{2} - 1}{\operatorname{sign}{\left(x^{2} - 1 \right)}}}}\right) \operatorname{re}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}}{\left(\left(\operatorname{re}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}\right)^{2} + \left(\operatorname{im}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}\right)^{2}\right)^{2}} - \frac{\cos{\left(\frac{\operatorname{atan_{2}}{\left(0,1 - x^{2} \right)}}{2} \right)} \operatorname{sign}{\left(x \right)}}{\sqrt{\frac{x^{2} - 1}{\operatorname{sign}{\left(x^{2} - 1 \right)}}} \left(\left(\operatorname{re}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}\right)^{2} + \left(\operatorname{im}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}\right)^{2}\right)}\right) \operatorname{re}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}}{\left(\operatorname{re}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}\right)^{2} + \left(\operatorname{im}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}\right)^{2}} - \frac{\left(- \frac{\left(- \frac{2 \sin{\left(\frac{\operatorname{atan_{2}}{\left(0,1 - x^{2} \right)}}{2} \right)} \operatorname{im}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)} \operatorname{sign}{\left(x \right)}}{\sqrt{\frac{x^{2} - 1}{\operatorname{sign}{\left(x^{2} - 1 \right)}}}} + \frac{2 \cos{\left(\frac{\operatorname{atan_{2}}{\left(0,1 - x^{2} \right)}}{2} \right)} \operatorname{re}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)} \operatorname{sign}{\left(x \right)}}{\sqrt{\frac{x^{2} - 1}{\operatorname{sign}{\left(x^{2} - 1 \right)}}}}\right) \operatorname{im}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}}{\left(\left(\operatorname{re}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}\right)^{2} + \left(\operatorname{im}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}\right)^{2}\right)^{2}} - \frac{\sin{\left(\frac{\operatorname{atan_{2}}{\left(0,1 - x^{2} \right)}}{2} \right)} \operatorname{sign}{\left(x \right)}}{\sqrt{\frac{x^{2} - 1}{\operatorname{sign}{\left(x^{2} - 1 \right)}}} \left(\left(\operatorname{re}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}\right)^{2} + \left(\operatorname{im}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}\right)^{2}\right)}\right) \operatorname{im}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}}{\left(\operatorname{re}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}\right)^{2} + \left(\operatorname{im}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}\right)}\right)^{2}}\right) \operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)}}{\operatorname{sign}{\left(\operatorname{acos}{\left(\frac{x}{\operatorname{sign}{\left(x \right)}} \right)} \right)}} = 0$$
Resolvermos esta ecuaciónSoluciones no halladas,
tal vez la función no tenga extremos