El profesor se sorprenderá mucho al ver tu solución correcta😉
2 cos(x)*cos(2*x) - sin(x)*sin (x) = 0
x1 = -40.1940889832618
x2 = -15.0613477545434
x3 = 16.3545787813545
x4 = 69.761653892381
x5 = -43.3356816368516
x6 = -59.0436449048005
x7 = -150.149831858905
x8 = -2.49497714018425
x9 = 41.4873200100729
x10 = 72.9032465459708
x11 = 54.053690624432
x12 = -68.4684228655699
x13 = 10.0713934741749
x14 = 82.3280245067402
x15 = -5.63656979377404
x16 = -46.4772742904414
x17 = -77.8932008263393
x18 = 160.867840846485
x19 = 47.7705053172524
x20 = 98.0359877746891
x21 = -93.6011640942883
x22 = -49.6188669440311
x23 = 57.1952832780218
x24 = -71.6100155191597
x25 = 66.6200612387912
x26 = 85.46961716033
x27 = 0.646615513405545
x28 = 63.4784685852014
x29 = 22.6377640885341
x30 = -84.1763861335189
x31 = -18.2029404081332
x32 = -706.211731544298
x33 = -11.9197551009536
x34 = -99.8843494014678
x35 = 60.3368759316116
x36 = -62.1852375583903
x37 = -24.4861257153128
x38 = 38.3457273564831
x39 = 91.7528024675096
x40 = -65.3268302119801
x41 = -37.052496329672
x42 = -33.9109036760822
x43 = 44.6289126636627
x44 = 88.6112098139198
x45 = -55.9020522512107
x46 = 76.0448391995606
x47 = 3.78820816699534
x48 = 19.4961714349443
x49 = 32.0625420493035
x50 = -87.3179787871087
x51 = -27.6277183689026
x52 = 25.7793567421239
x53 = -81.0347934799291
x53 = -81.0347934799291