El gráfico de la función cruce el eje T con f = 0
o sea hay que resolver la ecuación:
$$2 \left(- 2 \cos{\left(t \right)}\right) \left(2 - 2 \sin{\left(t \right)}\right) = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje T:
Solución analítica$$t_{1} = - \frac{\pi}{2}$$
$$t_{2} = \frac{\pi}{2}$$
Solución numérica$$t_{1} = 23.5619449019235$$
$$t_{2} = 64.4026120631021$$
$$t_{3} = -23.5619901092509$$
$$t_{4} = -20.4203522483337$$
$$t_{5} = -29.8451151764072$$
$$t_{6} = -39.2699081698724$$
$$t_{7} = -73.8274109605032$$
$$t_{8} = 98.9601685880785$$
$$t_{9} = 86.3937979737193$$
$$t_{10} = 7.85402509748832$$
$$t_{11} = -80.1106700221811$$
$$t_{12} = -89.5353906273091$$
$$t_{13} = 14.1371748702372$$
$$t_{14} = 48.6946861306418$$
$$t_{15} = -67.5442911095362$$
$$t_{16} = -64.4026493985908$$
$$t_{17} = 67.5442420521806$$
$$t_{18} = -70.6858347057703$$
$$t_{19} = -26.7035375555132$$
$$t_{20} = 42.4115008234622$$
$$t_{21} = -80.1105783828951$$
$$t_{22} = -73.827404839395$$
$$t_{23} = 4.71238898038469$$
$$t_{24} = 73.8274273593601$$
$$t_{25} = 20.42030673321$$
$$t_{26} = -7.85398163397448$$
$$t_{27} = -95.8185759344887$$
$$t_{28} = -36.1282765608558$$
$$t_{29} = -83.2522053201295$$
$$t_{30} = -1.5707963267949$$
$$t_{31} = -58.1194640914112$$
$$t_{32} = 58.1194603109949$$
$$t_{33} = 29.845130209103$$
$$t_{34} = 80.1106126665397$$
$$t_{35} = 20.4203109469995$$
$$t_{36} = 95.8186280030328$$
$$t_{37} = 51.8363266129711$$
$$t_{38} = 36.1283155162826$$
$$t_{39} = 61.261056745001$$
$$t_{40} = 92.6769832808989$$
$$t_{41} = -29.8451590169879$$
$$t_{42} = 17.2787595947439$$
$$t_{43} = -51.8362787842316$$
$$t_{44} = -45.553093477052$$
$$t_{45} = -14.1371669411541$$