El profesor se sorprenderá mucho al ver tu solución correcta😉
2 cos(6*a) + 2*sin (3)*a = 0
a*w^2 + b*w + c = 0
D = b^2 - 4 * a * c =
(0)^2 - 4 * (2*a) * (-1 + cos(6*a)) = -8*a*(-1 + cos(6*a))
w1 = (-b + sqrt(D)) / (2*a)
w2 = (-b - sqrt(D)) / (2*a)
a1 = 22.4371898633848
a2 = -15.5575472247082
a3 = 19.4868629778487
a4 = 21.5572541828652
a5 = 16.3749455306627
a6 = -16.613881216561
a7 = -7.11648131264187
a8 = -8.58124324607159
a9 = -3.95334391675847
a10 = -17.6706853730118
a11 = 8.06130285587446
a12 = 10.1408786031275
a13 = -1.84485342589612
a14 = 10.8079451629507
a15 = 14.2979865222072
a16 = -13.7785470887139
a17 = -9.22569071245858
a18 = 12.2198506919009
a19 = 0.780218019406661
a20 = -22.0739186285523
a21 = -4.42108732386026
a22 = -2.89908121958618
a23 = 0.26354893300603
a24 = 5.9812948647374
a25 = 8.69834426433557
a26 = -24.1321375075451
a27 = -23.1053465463062
a28 = 21.3755190874604
a29 = -24.0367065494849
a30 = 7.64374206681337
a31 = -21.906069387765
a32 = 18.199299398653
a33 = 23.5020312309464
a34 = -11.7001756107977
a35 = 23.6195992410805
a36 = -6.06202902385472
a37 = 3.42620737528089
a38 = 15.0295283507073
a39 = -3.38088040439158
a40 = -10.6606860054652
a41 = -20.0048924104767
a42 = 24.5747676066613
a43 = -13.4459616880429
a44 = 20.3156751820385
a45 = -16.8939441379493
a46 = -15.8558410595948
a47 = -17.9315754128756
a48 = -9.62103375835112
a49 = 16.085661500243
a50 = -0.260072918623045
a51 = -22.9690700625476
a52 = 3.90098959148124
a53 = 24.6412897647502
a53 = 24.6412897647502