El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\left(\cos{\left(x \right)} + 2 \cos{\left(1 \right)}\right) + \sin{\left(x \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - 2 \operatorname{atan}{\left(\frac{- \sqrt{2} \sqrt{-1 - \tan^{4}{\left(\frac{1}{2} \right)} + 6 \tan^{2}{\left(\frac{1}{2} \right)}} + \tan^{2}{\left(\frac{1}{2} \right)} + 1}{1 - 3 \tan^{2}{\left(\frac{1}{2} \right)}} \right)}$$
$$x_{2} = - 2 \operatorname{atan}{\left(\frac{\tan^{2}{\left(\frac{1}{2} \right)} + 1 + \sqrt{2} \sqrt{-1 - \tan^{4}{\left(\frac{1}{2} \right)} + 6 \tan^{2}{\left(\frac{1}{2} \right)}}}{1 - 3 \tan^{2}{\left(\frac{1}{2} \right)}} \right)}$$
Solución numérica$$x_{1} = 29.7608789184413$$
$$x_{2} = -1.65504761745666$$
$$x_{3} = -91.0219356634422$$
$$x_{4} = -7.93823292463625$$
$$x_{5} = 80.026361375878$$
$$x_{6} = -14.2214182318158$$
$$x_{7} = 455.615186061182$$
$$x_{8} = -78.4555650490831$$
$$x_{9} = 92.5927319902371$$
$$x_{10} = 17.1945083040821$$
$$x_{11} = 59.7745117088678$$
$$x_{12} = -9.34052667010761$$
$$x_{13} = 67.4599907615188$$
$$x_{14} = 23.4776936112617$$
$$x_{15} = 97.4736235519454$$
$$x_{16} = 73.7431760686984$$
$$x_{17} = -59.6060091275443$$
$$x_{18} = -139.885124375408$$
$$x_{19} = -28.1900825916464$$
$$x_{20} = -39.3541594605342$$
$$x_{21} = 86.3095466830575$$
$$x_{22} = 53.4913264016882$$
$$x_{23} = 3.22584394425156$$
$$x_{24} = -77.0532713036117$$
$$x_{25} = 66.0576970160474$$
$$x_{26} = -315.814312976436$$
$$x_{27} = -89.6196419179709$$
$$x_{28} = -65.8891944347239$$
$$x_{29} = 15.7922145586107$$
$$x_{30} = -70.7700859964321$$
$$x_{31} = 22.0753998657903$$
$$x_{32} = -45.6373447677138$$
$$x_{33} = 28.3585851729699$$
$$x_{34} = -21.9068972844668$$
$$x_{35} = 72.340882323227$$
$$x_{36} = -15.6237119772872$$
$$x_{37} = -64.4869006892525$$
$$x_{38} = -3.05734136292803$$
$$x_{39} = 34.6417704801495$$
$$x_{40} = -20.5046035389954$$
$$x_{41} = 48.61043483998$$
$$x_{42} = 78.6240676304066$$
$$x_{43} = 36.0440642256209$$
$$x_{44} = 42.3272495328004$$
$$x_{45} = -83.3364566107913$$
$$x_{46} = -51.9205300748933$$
$$x_{47} = -33.0709741533546$$
$$x_{48} = -95.9028272251505$$
$$x_{49} = -26.787788846175$$
$$x_{50} = -40.7564532060055$$
$$x_{51} = 9.50902925143114$$
$$x_{52} = -84.7387503562627$$
$$x_{53} = 4.62813768972293$$
$$x_{54} = 61.1768054543392$$
$$x_{55} = -34.473267898826$$
$$x_{56} = 47.2081410945087$$
$$x_{57} = -53.3228238203647$$
$$x_{58} = -72.1723797419035$$
$$x_{59} = 91.1904382447658$$
$$x_{60} = -47.0396385131851$$
$$x_{61} = 84.9072529375862$$
$$x_{62} = 40.9249557873291$$
$$x_{63} = 98.8759172974167$$
$$x_{64} = 54.8936201471596$$
$$x_{65} = 10.9113229969025$$
$$x_{66} = -58.2037153820729$$
$$x_{67} = -97.3051209706218$$