El profesor se sorprenderá mucho al ver tu solución correcta😉
/4*x\ /8*x\ 60 - 80*cos|---| + 20*cos|---| = 0 \ 5 / \ 5 /
x1 = -23.5624694368682
x2 = 62.8325471411379
x3 = -86.3938503245782
x4 = -7.85358945979783
x5 = 94.2477860034381
x6 = 0.0
x7 = 86.3933924555457
x8 = 7.85446845983481
x9 = -15.7080841507689
x9 = -15.7080841507689