El profesor se sorprenderá mucho al ver tu solución correcta😉
2 6*sin (x) + sin(x)*cos(x) - cos(2)*x = 0
x1 = -8.62449777918912
x2 = -5.68536914446323
x3 = -14.037541867905
x4 = -14.3324687484163
x5 = 0.0
x6 = -7.14691036918033
x7 = -10.5284877603804
x8 = -2.76553266959969
x9 = -11.5459015020338
x10 = -0.234247466953922
x11 = -3.76415394659379
x11 = -3.76415394659379