El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\sqrt{2 \cos^{2}{\left(x \right)} - \sqrt{2}} + \sqrt{2} \sin{\left(x \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - 2 \operatorname{atan}{\left(\frac{\sqrt{- 2 \sqrt{2} \sqrt{\sqrt{2} + 2} - 2 \sqrt{2} + 5 + 4 \sqrt{\sqrt{2} + 2}}}{\sqrt{3 - 2 \sqrt{2}}} \right)}$$
$$x_{2} = - 2 \operatorname{atan}{\left(\frac{\sqrt{- 4 \sqrt{\sqrt{2} + 2} - 2 \sqrt{2} + 5 + 2 \sqrt{2} \sqrt{\sqrt{2} + 2}}}{\sqrt{3 - 2 \sqrt{2}}} \right)}$$
Solución numérica$$x_{1} = -94.6404786893925$$
$$x_{2} = 91.4988860358027$$
$$x_{3} = -53.0143760293278$$
$$x_{4} = -0.392699081698724$$
$$x_{5} = -75.7909227678538$$
$$x_{6} = -69.5077374606742$$
$$x_{7} = -71.8639319508665$$
$$x_{8} = 9.8174770424681$$
$$x_{9} = 93.8550805259951$$
$$x_{10} = 85.2157007286231$$
$$x_{11} = -78.1471172580461$$
$$x_{12} = 12.1736715326604$$
$$x_{13} = 68.7223392972767$$
$$x_{14} = 31.0232274541992$$
$$x_{15} = -12.9590696960579$$
$$x_{16} = 5.89048622548086$$
$$x_{17} = 37.3064127613788$$
$$x_{18} = -2.74889357189107$$
$$x_{19} = -63.2245521534946$$
$$x_{20} = -56.941366846315$$
$$x_{21} = -38.0918109247762$$
$$x_{22} = -27.8816348006094$$
$$x_{23} = -19.2422550032375$$
$$x_{24} = 97.7820713429823$$
$$x_{25} = -82.0741080750334$$
$$x_{26} = 53.7997741927252$$
$$x_{27} = 60.0829594999048$$
$$x_{28} = 66.3661448070844$$
$$x_{29} = -31.8086256175967$$
$$x_{30} = -134.695785022662$$
$$x_{31} = 47.5165888855456$$
$$x_{32} = 41.233403578366$$
$$x_{33} = -25.5254403104171$$
$$x_{34} = -34.164820107789$$
$$x_{35} = -40.4480054149686$$
$$x_{36} = 28.6670329640069$$
$$x_{37} = 18.45685683984$$
$$x_{38} = -59.2975613365073$$
$$x_{39} = -9.03207887907065$$
$$x_{40} = 81.2887099116359$$
$$x_{41} = 16.1006623496477$$
$$x_{42} = 24.7400421470196$$
$$x_{43} = 43.5895980685584$$
$$x_{44} = -44.3749962319558$$
$$x_{45} = 3.53429173528852$$
$$x_{46} = 100.138265833175$$
$$x_{47} = -88.3572933822129$$
$$x_{48} = -50.6581815391354$$
$$x_{49} = 22.3838476568273$$
$$x_{50} = 56.1559686829176$$
$$x_{51} = -96.9966731795849$$
$$x_{52} = -65.5807466436869$$
$$x_{53} = -21.5984494934298$$
$$x_{54} = -84.4303025652257$$
$$x_{55} = -46.7311907221482$$
$$x_{56} = -15.3152641862502$$
$$x_{57} = 49.872783375738$$
$$x_{58} = 62.4391539900971$$
$$x_{59} = 87.5718952188155$$
$$x_{60} = 75.0055246044563$$
$$x_{61} = -90.7134878724053$$
$$x_{62} = 72.649330114264$$
$$x_{63} = -103.279858486764$$