El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\sin{\left(x - \frac{\pi}{4} \right)} + 1 = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \frac{\pi}{4}$$
$$x_{2} = \frac{7 \pi}{4}$$
Solución numérica$$x_{1} = -95.0331781100243$$
$$x_{2} = -82.4668068945042$$
$$x_{3} = -57.3340649383309$$
$$x_{4} = -7.06858300639465$$
$$x_{5} = 30.6305288846753$$
$$x_{6} = -13.3517682670521$$
$$x_{7} = 24.3473435691761$$
$$x_{8} = -51.050880160811$$
$$x_{9} = 24.3473428429411$$
$$x_{10} = 5.49778665744676$$
$$x_{11} = 74.6128260362059$$
$$x_{12} = -38.48451049568$$
$$x_{13} = 93.4623809641836$$
$$x_{14} = 80.89601130204$$
$$x_{15} = -76.1836223574705$$
$$x_{16} = -82.4668076486402$$
$$x_{17} = -69.9004361252132$$
$$x_{18} = 55.7632690917622$$
$$x_{19} = -44.7676949362075$$
$$x_{20} = 87.1791957268324$$
$$x_{21} = -63.6172513986433$$
$$x_{22} = 87.179196532163$$
$$x_{23} = 36.9137133606567$$
$$x_{24} = -44.7676957394645$$
$$x_{25} = -19.6349541562151$$
$$x_{26} = 55.7632697581448$$
$$x_{27} = 62.0464544435274$$
$$x_{28} = -32.2013245603751$$
$$x_{29} = -57.3340661448389$$
$$x_{30} = 99.7455669171649$$
$$x_{31} = 74.6128261686162$$
$$x_{32} = -32.2013246850922$$
$$x_{33} = 62.0464548197962$$
$$x_{34} = -82.4668084160019$$
$$x_{35} = -19.6349535784194$$
$$x_{36} = 43.1968985712882$$
$$x_{37} = -63.6172513160472$$
$$x_{38} = 74.6128253297082$$
$$x_{39} = 5.49778742084737$$
$$x_{40} = 24.3473430038548$$
$$x_{41} = 49.480083810736$$
$$x_{42} = 68.3296411023678$$
$$x_{43} = 55.7632695146533$$
$$x_{44} = -38.4845112392171$$
$$x_{45} = 36.9137135292544$$
$$x_{46} = -7.06858403154703$$
$$x_{47} = -25.9181398021191$$
$$x_{48} = -51.0508809532154$$
$$x_{49} = 68.3296401642101$$
$$x_{50} = 18.0641572998774$$
$$x_{51} = -38.4845097367869$$
$$x_{52} = 68.3296399673894$$
$$x_{53} = 43.1968993761393$$
$$x_{54} = -88.7499928946682$$
$$x_{55} = -38.4845089949562$$
$$x_{56} = -13.3517679070915$$
$$x_{57} = 30.6305291275487$$
$$x_{58} = -25.9181389861107$$
$$x_{59} = 18.0641581520455$$
$$x_{60} = 80.8960102705227$$
$$x_{61} = 68.3296407164102$$
$$x_{62} = 11.7809724171495$$
$$x_{63} = -19.6349542791514$$
$$x_{64} = 93.4623817358674$$
$$x_{65} = 30.6305281714525$$
$$x_{66} = 112.311938467621$$
$$x_{67} = -1100.34282803356$$
$$x_{68} = -0.785398584144886$$
$$x_{69} = 49.48008555195$$
$$x_{70} = 49.4800845783988$$
$$x_{71} = 5.49778620182618$$
$$x_{72} = -69.900436985499$$
$$x_{73} = -25.9181398431461$$
$$x_{74} = -76.1836217916099$$
$$x_{75} = -76.1836217199184$$
$$x_{76} = 11.7809725989712$$
$$x_{77} = -32.2013252080042$$
$$x_{78} = -63.6172507263591$$
$$x_{79} = 80.8960105177169$$
$$x_{80} = -88.7499920925274$$
$$x_{81} = -0.785397779984767$$
$$x_{82} = 99.7455662420405$$
$$x_{83} = -13.3517689867295$$
$$x_{84} = -7.06858379632121$$
$$x_{85} = 36.9137141478899$$
$$x_{86} = 11.7809719417438$$
$$x_{87} = -95.0331773153567$$
$$x_{88} = -57.3340654189707$$
$$x_{89} = 18.0641575835275$$
$$x_{90} = -101.316362571075$$
$$x_{91} = 62.0464552891756$$