El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\left|{\cos{\left(x \right)} + \frac{51}{100}}\right| = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \operatorname{acos}{\left(- \frac{51}{100} \right)} + 2 \pi$$
$$x_{2} = \operatorname{acos}{\left(- \frac{51}{100} \right)}$$
Solución numérica$$x_{1} = 96.3537607247643$$
$$x_{2} = -39.805092960148$$
$$x_{3} = 14.6723517314297$$
$$x_{4} = -58.6546488816868$$
$$x_{5} = 10.4603894972887$$
$$x_{6} = 52.3714635745072$$
$$x_{7} = -16.7435748044683$$
$$x_{8} = 4.17720419010909$$
$$x_{9} = 64.9378341888664$$
$$x_{10} = 23.0267601116478$$
$$x_{11} = -14.6723517314297$$
$$x_{12} = -8.38916642425008$$
$$x_{13} = -79.5754278762641$$
$$x_{14} = 39.805092960148$$
$$x_{15} = -98.4249837978029$$
$$x_{16} = -85.8586131834437$$
$$x_{17} = -2.1059811170705$$
$$x_{18} = -35.593130726007$$
$$x_{19} = -46.0882782673276$$
$$x_{20} = 20.9555370386093$$
$$x_{21} = -96.3537607247643$$
$$x_{22} = -4.17720419010909$$
$$x_{23} = 71.221019496046$$
$$x_{24} = 98.4249837978029$$
$$x_{25} = 92.1417984906233$$
$$x_{26} = -73.2922425690845$$
$$x_{27} = 2.1059811170705$$
$$x_{28} = 83.7873901104051$$
$$x_{29} = -71.221019496046$$
$$x_{30} = -52.3714635745072$$
$$x_{31} = -83.7873901104051$$
$$x_{32} = -92.1417984906233$$
$$x_{33} = 54.4426866475458$$
$$x_{34} = -48.1595013403662$$
$$x_{35} = -1340.42445154632$$
$$x_{36} = 8.38916642425008$$
$$x_{37} = 27.2387223457888$$
$$x_{38} = -90.0705754175847$$
$$x_{39} = 35.593130726007$$
$$x_{40} = 67.009057261905$$
$$x_{41} = -20.9555370386093$$
$$x_{42} = 29.3099454188274$$
$$x_{43} = -60.7258719547254$$
$$x_{44} = -77.5042048032255$$
$$x_{45} = -67.009057261905$$
$$x_{46} = -64.9378341888664$$
$$x_{47} = 73.2922425690845$$
$$x_{48} = -33.5219076529684$$
$$x_{49} = 41.8763160331866$$
$$x_{50} = -29.3099454188274$$
$$x_{51} = 85.8586131834437$$
$$x_{52} = 48.1595013403662$$
$$x_{53} = -23.0267601116478$$
$$x_{54} = 79.5754278762641$$
$$x_{55} = -41.8763160331866$$
$$x_{56} = -10.4603894972887$$
$$x_{57} = 58.6546488816868$$
$$x_{58} = -54.4426866475458$$