El profesor se sorprenderá mucho al ver tu solución correcta😉
-7*x x 2*sin(7*x)*E = -3*cos(5*x)*E
x1 = 0.322025528215997
x2 = 22.3053078404875
x3 = 2.19911485657007
x4 = -1.79519569022237
x5 = 26.0752190247953
x6 = 5.96902604182061
x7 = 24.1902634326414
x8 = -3.1415926535924
x9 = 16.0221225333079
x10 = 14.1371669411541
x11 = 12.2522113490002
x12 = 4.08407044966673
x13 = 27.9601746169492
x14 = 7.85398163397448
x15 = 17.9070781254618
x16 = 10.9955742875643
x16 = 10.9955742875643