El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$2 \sin{\left(x - \frac{\pi}{4} \right)} + 1 = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \frac{\pi}{12}$$
$$x_{2} = \frac{17 \pi}{12}$$
Solución numérica$$x_{1} = -75.1364242983559$$
$$x_{2} = 10.7337748997651$$
$$x_{3} = -83.5140047079287$$
$$x_{4} = -89.7971900151083$$
$$x_{5} = -100.269165527074$$
$$x_{6} = 50.5272818452358$$
$$x_{7} = 17.0169602069447$$
$$x_{8} = -1.83259571459405$$
$$x_{9} = 69.3768377667746$$
$$x_{10} = -144.251462677331$$
$$x_{11} = 94.5095789954929$$
$$x_{12} = 73.565627971561$$
$$x_{13} = 6.54498469497874$$
$$x_{14} = -37.4373124552784$$
$$x_{15} = -93.9859802198946$$
$$x_{16} = 92.4151838930998$$
$$x_{17} = 23.3001455141243$$
$$x_{18} = -68.8532389911763$$
$$x_{19} = 31.6777259236971$$
$$x_{20} = -31.1541271480988$$
$$x_{21} = 86.1319985859202$$
$$x_{22} = -8.11578102177363$$
$$x_{23} = -87.7027949127151$$
$$x_{24} = -12.30457122656$$
$$x_{25} = -177.761784315622$$
$$x_{26} = 67.2824426643814$$
$$x_{27} = -58.3812634792103$$
$$x_{28} = 25.3945406165175$$
$$x_{29} = 48.4328867428426$$
$$x_{30} = -39.5317075576716$$
$$x_{31} = 63.093652459595$$
$$x_{32} = -64.6644487863899$$
$$x_{33} = -20.6821516361328$$
$$x_{34} = -45.8148928648512$$
$$x_{35} = -81.4196096055355$$
$$x_{36} = -70.9476340935695$$
$$x_{37} = -18.5877565337396$$
$$x_{38} = 56.8104671524154$$
$$x_{39} = -24.8709418409192$$
$$x_{40} = -96.0803753222878$$
$$x_{41} = 100.792764302673$$
$$x_{42} = 75.6600230739542$$
$$x_{43} = -62.5700536839967$$
$$x_{44} = -6.02138591938044$$
$$x_{45} = -43.720497762458$$
$$x_{46} = 29.5833308213039$$
$$x_{47} = 44.2440965380563$$
$$x_{48} = -14.3989663289532$$
$$x_{49} = 12.8281700021583$$
$$x_{50} = -77.2308194007491$$
$$x_{51} = 88.2263936883134$$
$$x_{52} = -52.0980781720307$$
$$x_{53} = 42.1497014356631$$
$$x_{54} = -33.248522250492$$
$$x_{55} = 243.21163126541$$
$$x_{56} = 35.8665161284835$$
$$x_{57} = 60.9992573572018$$
$$x_{58} = -50.0036830696375$$
$$x_{59} = -26.9653369433124$$
$$x_{60} = 0.261799387799149$$
$$x_{61} = 37.9609112308767$$
$$x_{62} = 79.8488132787406$$
$$x_{63} = 19.1113553093379$$
$$x_{64} = 4.45058959258554$$
$$x_{65} = 81.9432083811338$$
$$x_{66} = 54.7160720500222$$
$$x_{67} = 98.6983692002793$$
$$x_{68} = -56.2868683768171$$