El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\cos{\left(\frac{4 - x}{2} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 4 + 3 \pi$$
$$x_{2} = \pi + 4$$
Solución numérica$$x_{1} = 44.8407044966673$$
$$x_{2} = -30.5575191894877$$
$$x_{3} = 13.4247779607694$$
$$x_{4} = -49.4070751110265$$
$$x_{5} = 25.9911485751286$$
$$x_{6} = -36.8407044966673$$
$$x_{7} = -99.6725575684632$$
$$x_{8} = 76.2566310325652$$
$$x_{9} = 95.106186954104$$
$$x_{10} = -24.2743338823081$$
$$x_{11} = 7.14159265358979$$
$$x_{12} = 7517046.68028432$$
$$x_{13} = -17.9911485751286$$
$$x_{14} = 32.2743338823081$$
$$x_{15} = -55.6902604182061$$
$$x_{16} = -93.3893722612836$$
$$x_{17} = 82.5398163397448$$
$$x_{18} = -11.707963267949$$
$$x_{19} = -80.8230016469244$$
$$x_{20} = 88.8230016469244$$
$$x_{21} = -61.9734457253857$$
$$x_{22} = -74.5398163397448$$
$$x_{23} = 19.707963267949$$
$$x_{24} = -5.42477796076938$$
$$x_{25} = 0.858407346410207$$
$$x_{26} = -43.1238898038469$$
$$x_{27} = 57.4070751110265$$
$$x_{28} = 63.6902604182061$$
$$x_{29} = 51.1238898038469$$
$$x_{30} = -68.2566310325652$$
$$x_{31} = 101.389372261284$$
$$x_{32} = -156.221225333079$$
$$x_{33} = 38.5575191894877$$
$$x_{34} = -87.106186954104$$
$$x_{35} = 69.9734457253857$$
$$x_{36} = -9587.28237140964$$