El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{3 \left(\cos{\left(x \right)} + 1\right)}{4} + \sin{\left(x \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - 2 \operatorname{atan}{\left(\frac{3}{4} \right)}$$
Solución numérica$$x_{1} = 65.9734457253857$$
$$x_{2} = 67.8280361613889$$
$$x_{3} = -91.106186954104$$
$$x_{4} = -59.6902604182061$$
$$x_{5} = -21.9911485751286$$
$$x_{6} = 17.5625537039522$$
$$x_{7} = 21.9911485751286$$
$$x_{8} = 42.6952949326705$$
$$x_{9} = 350.57137498447$$
$$x_{10} = 3.14159265358979$$
$$x_{11} = 48.9784802398501$$
$$x_{12} = -3.14159265358979$$
$$x_{13} = -15.707963267949$$
$$x_{14} = -1.28700221758657$$
$$x_{15} = -53.4070751110265$$
$$x_{16} = -70.402040596562$$
$$x_{17} = -72.2566310325652$$
$$x_{18} = 84.8230016469244$$
$$x_{19} = -71059.6842315475$$
$$x_{20} = -65.9734457253857$$
$$x_{21} = -38.9861140606641$$
$$x_{22} = 80.3944067757481$$
$$x_{23} = 9.42477796076938$$
$$x_{24} = -26.4197434463049$$
$$x_{25} = -40.8407044966673$$
$$x_{26} = 97.3893722612836$$
$$x_{27} = -45.2692993678437$$
$$x_{28} = -76.6852259037416$$
$$x_{29} = 53.4070751110265$$
$$x_{30} = 30.1289243183114$$
$$x_{31} = -84.8230016469244$$
$$x_{32} = -95.5347818252804$$
$$x_{33} = 34.5575191894877$$
$$x_{34} = 59.6902604182061$$
$$x_{35} = -28.2743338823081$$
$$x_{36} = -89.2515965181008$$
$$x_{37} = -13.8533728319457$$
$$x_{38} = 15.707963267949$$
$$x_{39} = 23.8457390111318$$
$$x_{40} = 11.2793683967726$$
$$x_{41} = 61.5448508542093$$
$$x_{42} = -82.9684112109212$$
$$x_{43} = -51.5524846750233$$
$$x_{44} = 91.106186954104$$
$$x_{45} = 99.2439626972868$$
$$x_{46} = 86.6775920829276$$
$$x_{47} = 74.1112214685685$$
$$x_{48} = -47.1238898038469$$
$$x_{49} = 72.2566310325652$$
$$x_{50} = -34.5575191894877$$
$$x_{51} = -97.3893722612836$$
$$x_{52} = 92.9607773901072$$
$$x_{53} = -64.1188552893824$$
$$x_{54} = -32.7029287534845$$
$$x_{55} = 40.8407044966673$$
$$x_{56} = -7.57018752476616$$
$$x_{57} = 78.5398163397448$$
$$x_{58} = -9.42477796076938$$
$$x_{59} = 733.845678722425$$
$$x_{60} = -57.8356699822028$$
$$x_{61} = 55.2616655470297$$
$$x_{62} = -78.5398163397448$$
$$x_{63} = -20.1365581391253$$
$$x_{64} = 47.1238898038469$$
$$x_{65} = 28.2743338823081$$
$$x_{66} = 4.99618308959302$$
$$x_{67} = 36.4121096254909$$