El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$8 - 9 \sin{\left(x - 8 \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \operatorname{asin}{\left(\frac{8}{9} \right)} + 8$$
$$x_{2} = - \operatorname{asin}{\left(\frac{8}{9} \right)} + \pi + 8$$
Solución numérica$$x_{1} = 79.1617169554308$$
$$x_{2} = 2.81172876995489$$
$$x_{3} = -90.4842863384181$$
$$x_{4} = 22.6130491908145$$
$$x_{5} = -85.1528655305593$$
$$x_{6} = 34.2276553058528$$
$$x_{7} = 16.3298638836349$$
$$x_{8} = 27.9444699986732$$
$$x_{9} = -9.75464184440428$$
$$x_{10} = 9.09491407713448$$
$$x_{11} = -53.7369389946614$$
$$x_{12} = -15.086062652263$$
$$x_{13} = 10.0466785764553$$
$$x_{14} = 4520.42196463208$$
$$x_{15} = 91.7280875697899$$
$$x_{16} = 90.7763230704691$$
$$x_{17} = -173.117459831074$$
$$x_{18} = 66.5953463410716$$
$$x_{19} = -21.3692479594426$$
$$x_{20} = 59.3603965345712$$
$$x_{21} = -16.0378271515839$$
$$x_{22} = 65.6435818417508$$
$$x_{23} = -78.8696802233797$$
$$x_{24} = 3.76349326927573$$
$$x_{25} = 562.015221108938$$
$$x_{26} = -8.80287734508345$$
$$x_{27} = 47.7457904195328$$
$$x_{28} = 54.0289757267124$$
$$x_{29} = -97.7192361449185$$
$$x_{30} = -10251.3466925471$$
$$x_{31} = -52.7851744953405$$
$$x_{32} = 60.312161033892$$
$$x_{33} = 21.6612846914937$$
$$x_{34} = 1090.75455141134$$
$$x_{35} = -84.2011010312385$$
$$x_{36} = 72.8785316482512$$
$$x_{37} = 28.8962344979941$$
$$x_{38} = -28.604197765943$$
$$x_{39} = -96.7674716455977$$
$$x_{40} = -33.9356185738018$$
$$x_{41} = -27.6524332666222$$
$$x_{42} = 15.3780993843141$$
$$x_{43} = -41.1705683803022$$
$$x_{44} = 46.794025920212$$
$$x_{45} = 97.0595083776487$$
$$x_{46} = -72.5864949162001$$
$$x_{47} = -3.47145653722469$$
$$x_{48} = 35.1794198051737$$
$$x_{49} = 41.4626051123532$$
$$x_{50} = -66.3033096090206$$
$$x_{51} = -59.0683598025201$$
$$x_{52} = 53.0772112273916$$
$$x_{53} = -40.2188038809814$$
$$x_{54} = -2.51969203790386$$
$$x_{55} = 85.4449022626104$$
$$x_{56} = 71.9267671489303$$
$$x_{57} = 78.2099524561099$$
$$x_{58} = -91.4360508377389$$
$$x_{59} = -65.3515451096997$$
$$x_{60} = -47.4537536874818$$
$$x_{61} = -71.6347304168793$$
$$x_{62} = -22.3210124587635$$
$$x_{63} = -436.059478233295$$
$$x_{64} = -34.8873830731226$$
$$x_{65} = -77.9179157240589$$
$$x_{66} = 40.5108406130324$$
$$x_{67} = 98.0112728769695$$
$$x_{68} = -228.714363096369$$
$$x_{69} = 2699.24999004932$$
$$x_{70} = -60.020124301841$$
$$x_{71} = 84.4931377632895$$
$$x_{72} = -46.501989188161$$