El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\sin{\left(\frac{1}{\cos{\left(x \right)}} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \operatorname{acos}{\left(\frac{1}{\pi} \right)} + 2 \pi$$
$$x_{2} = \operatorname{acos}{\left(\frac{1}{\pi} \right)}$$
Solución numérica$$x_{1} = -30.169076316035$$
$$x_{2} = 27.0274836624452$$
$$x_{3} = -76.8091853865648$$
$$x_{4} = 96.1425220414207$$
$$x_{5} = -36.4522616232146$$
$$x_{6} = -80.4345587734717$$
$$x_{7} = -140.124819191678$$
$$x_{8} = -60.937110638069$$
$$x_{9} = -35.8043694093506$$
$$x_{10} = 588.724676441154$$
$$x_{11} = 23.2379987949915$$
$$x_{12} = -346.82204211474$$
$$x_{13} = 42.2516661970771$$
$$x_{14} = 52.1602248911636$$
$$x_{15} = -33.3106689696248$$
$$x_{16} = -102.4257073486$$
$$x_{17} = -1.89474243372688$$
$$x_{18} = -79.7866665596078$$
$$x_{19} = 57.7955179844792$$
$$x_{20} = -45.22914737012$$
$$x_{21} = -67.8681881591125$$
$$x_{22} = -96.1425220414207$$
$$x_{23} = 64.2428147722056$$
$$x_{24} = -58.4434101983432$$
$$x_{25} = -64.5624840249759$$
$$x_{26} = -95.9784105608738$$
$$x_{27} = -1.24685021986292$$
$$x_{28} = 167.751260860122$$
$$x_{29} = -73.5034812524282$$
$$x_{30} = 10.8357396611791$$
$$x_{31} = -82.9282592131975$$
$$x_{32} = -67.6505454465008$$
$$x_{33} = 35.8043694093506$$
$$x_{34} = -4.38844287345271$$
$$x_{35} = -23.8858910088554$$
$$x_{36} = 86.0698518667873$$
$$x_{37} = 14.461113048086$$
$$x_{38} = -20.7442983552656$$
$$x_{39} = 79.7866665596078$$
$$x_{40} = -57.7955179844792$$
$$x_{41} = 95.4946298275567$$
$$x_{42} = -89.8593367342411$$
$$x_{43} = -16.9548134878119$$
$$x_{44} = 74.1513734662921$$
$$x_{45} = 30.0049648354882$$
$$x_{46} = -64.0787032916588$$
$$x_{47} = -95.4946298275567$$
$$x_{48} = 89.2114445203771$$
$$x_{49} = -8.17792774090646$$
$$x_{50} = -45.877039583984$$
$$x_{51} = 8.17792774090646$$
$$x_{52} = 13.9773323147689$$