El profesor se sorprenderá mucho al ver tu solución correcta😉
4 4*cos (x) - 5*cos(2*x) - 1 = 0
a*v^2 + b*v + c = 0
D = b^2 - 4 * a * c =
(-10)^2 - 4 * (4) * (-2) = 132
v1 = (-b + sqrt(D)) / (2*a)
v2 = (-b - sqrt(D)) / (2*a)
-3*pi x1 = ----- 4
-pi x2 = ---- 4
pi x3 = -- 4
3*pi x4 = ---- 4
/ ___\ x5 = -I*log\-1 + \/ 2 /
/ ___\ x6 = -I*log\1 + \/ 2 /
/ ___\ x7 = pi - I*log\-1 + \/ 2 /
/ ___\ x8 = pi - I*log\1 + \/ 2 /
x8 = pi - i*log(1 + sqrt(2))
suma
3*pi pi pi 3*pi / ___\ / ___\ / ___\ / ___\ - ---- - -- + -- + ---- - I*log\-1 + \/ 2 / - I*log\1 + \/ 2 / + pi - I*log\-1 + \/ 2 / + pi - I*log\1 + \/ 2 / 4 4 4 4
=
/ ___\ / ___\ 2*pi - 2*I*log\1 + \/ 2 / - 2*I*log\-1 + \/ 2 /
producto
-3*pi -pi pi 3*pi / / ___\\ / / ___\\ / / ___\\ / / ___\\ -----*----*--*----*\-I*log\-1 + \/ 2 //*\-I*log\1 + \/ 2 //*\pi - I*log\-1 + \/ 2 //*\pi - I*log\1 + \/ 2 // 4 4 4 4
=
4 / / ___\\ / / ___\\ / ___\ / ___\ -9*pi *\pi - I*log\1 + \/ 2 //*\pi - I*log\-1 + \/ 2 //*log\1 + \/ 2 /*log\-1 + \/ 2 / -------------------------------------------------------------------------------------- 256
-9*pi^4*(pi - i*log(1 + sqrt(2)))*(pi - i*log(-1 + sqrt(2)))*log(1 + sqrt(2))*log(-1 + sqrt(2))/256
x1 = -55.7632696012188
x2 = 2.35619449019234
x3 = 19.6349540849362
x4 = -46.3384916404494
x5 = -27.4889357189107
x6 = 99.7455667514759
x7 = 33.7721210260903
x8 = -54.1924732744239
x9 = 38.484510006475
x10 = 96.6039740978861
x11 = -32.2013246992954
x12 = -71.4712328691678
x13 = -41.6261026600648
x14 = 62.0464549083984
x15 = 91.8915851175014
x16 = 25.9181393921158
x17 = 8.63937979737193
x18 = -19.6349540849362
x19 = -101.316363078271
x20 = -85.6083998103219
x21 = 24.3473430653209
x22 = 76.1836218495525
x23 = -35.3429173528852
x24 = -49.4800842940392
x25 = 82.4668071567321
x26 = -93.4623814442964
x27 = -99.7455667514759
x28 = 77.7544181763474
x29 = 46.3384916404494
x30 = -5.49778714378214
x31 = 16.4933614313464
x32 = -11.7809724509617
x33 = -3.92699081698724
x34 = 131.161493287374
x35 = -142.157067574938
x36 = -18.0641577581413
x37 = -98.174770424681
x38 = -79.3252145031423
x39 = -62.0464549083984
x40 = 93.4623814442964
x41 = 74.6128255227576
x42 = -13.3517687777566
x43 = -24.3473430653209
x44 = 18.0641577581413
x45 = 60.4756585816035
x46 = 11.7809724509617
x47 = 69.9004365423729
x48 = 55.7632696012188
x49 = 47.9092879672443
x50 = -63.6172512351933
x51 = 54.1924732744239
x52 = -47.9092879672443
x53 = -68.329640215578
x54 = 706.072948894306
x55 = 40.0553063332699
x56 = -84.037603483527
x57 = -57.3340659280137
x58 = -25.9181393921158
x59 = -10.2101761241668
x60 = -91.8915851175014
x61 = 712.356134201486
x62 = -69.9004365423729
x63 = 41.6261026600648
x64 = 90.3207887907066
x65 = 3.92699081698724
x66 = 32.2013246992954
x67 = -2.35619449019234
x68 = -90.3207887907066
x69 = -77.7544181763474
x70 = 30.6305283725005
x71 = 85.6083998103219
x72 = -76.1836218495525
x73 = 98.174770424681
x74 = 52.621676947629
x75 = -310.232274541992
x76 = -40.0553063332699
x77 = 44.7676953136546
x78 = 63.6172512351933
x79 = 68.329640215578
x80 = -33.7721210260903
x81 = 10.2101761241668
x82 = 84.037603483527
x82 = 84.037603483527