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$$\frac{\cos{\left(\frac{x - 2}{2} \right)} \operatorname{sign}{\left(\sin{\left(\frac{x}{2} - 1 \right)} \right)}}{2} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = 80.5398163397448$$
$$x_{2} = -82.8230016469244$$
$$x_{3} = -76.5398163397448$$
$$x_{4} = 86.8230016469244$$
$$x_{5} = 36.5575191894877$$
$$x_{6} = 67.9734457253857$$
$$x_{7} = 30.2743338823081$$
$$x_{8} = -13.707963267949$$
$$x_{9} = -1.14159265358979$$
$$x_{10} = -32.5575191894877$$
$$x_{11} = 93.106186954104$$
$$x_{12} = 74.2566310325652$$
$$x_{13} = -26.2743338823081$$
$$x_{14} = 61.6902604182061$$
$$x_{15} = -57.6902604182061$$
$$x_{16} = 5.14159265358979$$
$$x_{17} = -101.672557568463$$
$$x_{18} = 42.8407044966673$$
$$x_{19} = -1672.46888436336$$
$$x_{20} = 17.707963267949$$
$$x_{21} = 105.672557568463$$
$$x_{22} = -89.106186954104$$
$$x_{23} = 23.9911485751286$$
$$x_{24} = 2$$
$$x_{25} = -95.3893722612836$$
$$x_{26} = 11.4247779607694$$
$$x_{27} = 99.3893722612836$$
$$x_{28} = 49.1238898038469$$
$$x_{29} = -45.1238898038469$$
$$x_{30} = -63.9734457253857$$
$$x_{31} = -70.2566310325652$$
$$x_{32} = -7.42477796076938$$
$$x_{33} = -51.4070751110265$$
$$x_{34} = -164.504410640259$$
$$x_{35} = -38.8407044966673$$
$$x_{36} = 55.4070751110265$$
$$x_{37} = -19.9911485751286$$
$$x_{38} = -120.522113490002$$
$$x_{39} = -9746.36200408913$$
Signos de extremos en los puntos:
(80.53981633974483, 1)
(-82.82300164692441, 1)
(-76.53981633974483, 1)
(86.82300164692441, 1)
(36.55751918948773, 1)
(67.97344572538566, 1)
(30.274333882308138, 1)
(-13.707963267948966, 1)
(-1.1415926535897933, 1)
(-32.55751918948773, 1)
(93.106186954104, 1)
(74.25663103256524, 1)
(-26.274333882308138, 1)
(61.69026041820607, 1)
(-57.69026041820607, 1)
(5.141592653589793, 1)
(-101.67255756846318, 1)
(42.840704496667314, 1)
(-1672.4688843633598, 1)
(17.707963267948966, 1)
(105.67255756846318, 1)
(-89.106186954104, 1)
(23.991148575128552, 1)
(2, 0)
(-95.3893722612836, 1)
(11.42477796076938, 1)
(99.3893722612836, 1)
(49.1238898038469, 1)
(-45.1238898038469, 1)
(-63.97344572538566, 1)
(-70.25663103256524, 1)
(-7.424777960769379, 1)
(-51.40707511102649, 1)
(-164.50441064025904, 1)
(-38.840704496667314, 1)
(55.40707511102649, 1)
(-19.991148575128552, 1)
(-120.52211349000194, 1)
(-9746.36200408913, 1)
Intervalos de crecimiento y decrecimiento de la función:Hallemos los intervalos donde la función crece y decrece y también los puntos mínimos y máximos de la función, para lo cual miramos cómo se comporta la función en los extremos con desviación mínima del extremo:
Puntos mínimos de la función:
$$x_{1} = 2$$
Puntos máximos de la función:
$$x_{1} = 80.5398163397448$$
$$x_{1} = -82.8230016469244$$
$$x_{1} = -76.5398163397448$$
$$x_{1} = 86.8230016469244$$
$$x_{1} = 36.5575191894877$$
$$x_{1} = 67.9734457253857$$
$$x_{1} = 30.2743338823081$$
$$x_{1} = -13.707963267949$$
$$x_{1} = -1.14159265358979$$
$$x_{1} = -32.5575191894877$$
$$x_{1} = 93.106186954104$$
$$x_{1} = 74.2566310325652$$
$$x_{1} = -26.2743338823081$$
$$x_{1} = 61.6902604182061$$
$$x_{1} = -57.6902604182061$$
$$x_{1} = 5.14159265358979$$
$$x_{1} = -101.672557568463$$
$$x_{1} = 42.8407044966673$$
$$x_{1} = -1672.46888436336$$
$$x_{1} = 17.707963267949$$
$$x_{1} = 105.672557568463$$
$$x_{1} = -89.106186954104$$
$$x_{1} = 23.9911485751286$$
$$x_{1} = -95.3893722612836$$
$$x_{1} = 11.4247779607694$$
$$x_{1} = 99.3893722612836$$
$$x_{1} = 49.1238898038469$$
$$x_{1} = -45.1238898038469$$
$$x_{1} = -63.9734457253857$$
$$x_{1} = -70.2566310325652$$
$$x_{1} = -7.42477796076938$$
$$x_{1} = -51.4070751110265$$
$$x_{1} = -164.504410640259$$
$$x_{1} = -38.8407044966673$$
$$x_{1} = 55.4070751110265$$
$$x_{1} = -19.9911485751286$$
$$x_{1} = -120.522113490002$$
$$x_{1} = -9746.36200408913$$
Decrece en los intervalos
$$\left(-\infty, -9746.36200408913\right] \cup \left[2, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, 2\right] \cup \left[105.672557568463, \infty\right)$$