El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$3 \sin{\left(x \right)} + 5 \cos{\left(x \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \operatorname{atan}{\left(\frac{5}{3} \right)}$$
Solución numérica$$x_{1} = 71.2262542060409$$
$$x_{2} = -38.7294886696018$$
$$x_{3} = -85.8533784734487$$
$$x_{4} = 99.5005880883491$$
$$x_{5} = 105.783773395529$$
$$x_{6} = -63.8622298983202$$
$$x_{7} = -95.2781564342181$$
$$x_{8} = -10.4551547872937$$
$$x_{9} = -32.4463033624222$$
$$x_{10} = -35.587896016012$$
$$x_{11} = -73.2870078590896$$
$$x_{12} = -1.03037682652431$$
$$x_{13} = 5.25280848065527$$
$$x_{14} = 46.0935129773226$$
$$x_{15} = 55.518290938092$$
$$x_{16} = -13.5967474408835$$
$$x_{17} = -41.8710813231916$$
$$x_{18} = 36.6687350165532$$
$$x_{19} = 83.7926248204001$$
$$x_{20} = 64.9430688988613$$
$$x_{21} = 96.3589954347593$$
$$x_{22} = 77.5094395132205$$
$$x_{23} = -88.9949711270385$$
$$x_{24} = 86.9342174739899$$
$$x_{25} = -29.3047107088325$$
$$x_{26} = -23.0215254016529$$
$$x_{27} = -315.189642185504$$
$$x_{28} = -45.0126739767814$$
$$x_{29} = 58.6598835916818$$
$$x_{30} = 80.6510321668103$$
$$x_{31} = -54.4374519375508$$
$$x_{32} = -26.1631180552427$$
$$x_{33} = 61.8014762452716$$
$$x_{34} = 33.5271423629634$$
$$x_{35} = 165.474033813735$$
$$x_{36} = -19.8799327480631$$
$$x_{37} = 17.8191790950144$$
$$x_{38} = -51.295859283961$$
$$x_{39} = 74.3678468596307$$
$$x_{40} = 102.642180741939$$
$$x_{41} = -57.5790445911406$$
$$x_{42} = -76.4286005126794$$
$$x_{43} = 42.9519203237328$$
$$x_{44} = 68.0846615524511$$
$$x_{45} = 52.3766982845022$$
$$x_{46} = -60.7206372447304$$
$$x_{47} = 93.2174027811695$$
$$x_{48} = 27.2439570557838$$
$$x_{49} = 90.0758101275797$$
$$x_{50} = -82.7117858198589$$
$$x_{51} = -98.4197490878079$$
$$x_{52} = -79.5701931662691$$
$$x_{53} = -70.1454152054998$$
$$x_{54} = -92.1365637806283$$
$$x_{55} = 14.6775864414247$$
$$x_{56} = -16.7383400944733$$
$$x_{57} = 39.810327670143$$
$$x_{58} = -48.1542666303712$$
$$x_{59} = 8.39440113424507$$
$$x_{60} = -4.17196948011411$$
$$x_{61} = -67.00382255191$$
$$x_{62} = 11.5359937878349$$
$$x_{63} = 30.3855497093736$$
$$x_{64} = -7.3135621337039$$
$$x_{65} = 2.11121582706548$$
$$x_{66} = 24.102364402194$$
$$x_{67} = 20.9607717486042$$
$$x_{68} = 49.2351056309124$$