El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$e^{- \frac{72 x}{25}} \cos^{2}{\left(\frac{157}{200} - \frac{24 x}{25} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \frac{157}{192} + \frac{25 \pi}{48}$$
$$x_{2} = \frac{157}{192} + \frac{25 \pi}{16}$$
Solución numérica$$x_{1} = 74.4487859356586$$
$$x_{2} = 100.628710646354$$
$$x_{3} = 94.0837157643387$$
$$x_{4} = 80.9937685346766$$
$$x_{5} = 84.2662337289759$$
$$x_{6} = 90.8112338896086$$
$$x_{7} = 12.2714019748005$$
$$x_{8} = 87.5387460358658$$
$$x_{9} = 22.0889087808077$$
$$x_{10} = 25.3613946002461$$
$$x_{11} = 94.083740427439$$
$$x_{12} = 77.7212781309262$$
$$x_{13} = 28.6338800741708$$
$$x_{14} = 51.541330160502$$
$$x_{15} = 74.4487555969189$$
$$x_{16} = 31.9063666561407$$
$$x_{17} = 18.8164149719212$$
$$x_{18} = 2.45395428294009$$
$$x_{19} = 48.2688473574735$$
$$x_{20} = 15.5439142849367$$
$$x_{21} = 5.72644656676913$$
$$x_{22} = 97.3562263239178$$
$$x_{23} = 41.7238488667711$$
$$x_{24} = 100.628724340176$$
$$x_{25} = 64.6312953557277$$
$$x_{26} = 31.9063856743375$$
$$x_{27} = 35.1788740160063$$
$$x_{28} = 58.0862998625569$$
$$x_{29} = 54.8138200279205$$
$$x_{30} = 2.45392405502383$$
$$x_{31} = 12.271431533034$$
$$x_{32} = 67.9037825567114$$
$$x_{33} = 90.8112466405332$$
$$x_{34} = 54.8138308062679$$
$$x_{35} = 8.99893685240369$$
$$x_{36} = 77.7212647562213$$
$$x_{37} = 38.4513398245243$$
$$x_{38} = 41.7238623511879$$
$$x_{39} = 38.4513701093173$$
$$x_{40} = 28.6338926811594$$
$$x_{41} = 64.6313085106955$$
$$x_{42} = 84.2662631818945$$
$$x_{43} = 22.0888839608848$$
$$x_{44} = 44.9963526935966$$
$$x_{45} = 61.3588104621724$$
$$x_{46} = 5.72643297713152$$
$$x_{47} = 18.8164052209165$$
$$x_{48} = 58.0863246055529$$
$$x_{49} = 48.2688178515448$$
$$x_{50} = 67.9038014968815$$
$$x_{51} = 71.1762898662776$$