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cos(3*x-pi/3)=-1/2 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
   /      pi\       
cos|3*x - --| = -1/2
   \      3 /       
$$\cos{\left(3 x - \frac{\pi}{3} \right)} = - \frac{1}{2}$$
Solución detallada
Tenemos la ecuación
$$\cos{\left(3 x - \frac{\pi}{3} \right)} = - \frac{1}{2}$$
es la ecuación trigonométrica más simple
Esta ecuación se reorganiza en
$$3 x + \frac{\pi}{6} = 2 \pi n + \operatorname{asin}{\left(- \frac{1}{2} \right)}$$
$$3 x + \frac{\pi}{6} = 2 \pi n - \operatorname{asin}{\left(- \frac{1}{2} \right)} + \pi$$
O
$$3 x + \frac{\pi}{6} = 2 \pi n - \frac{\pi}{6}$$
$$3 x + \frac{\pi}{6} = 2 \pi n + \frac{7 \pi}{6}$$
, donde n es cualquier número entero
Transportemos
$$\frac{\pi}{6}$$
al miembro derecho de la ecuación
con el signo opuesto, en total:
$$3 x = 2 \pi n - \frac{\pi}{3}$$
$$3 x = 2 \pi n + \pi$$
Dividamos ambos miembros de la ecuación obtenida en
$$3$$
obtenemos la respuesta:
$$x_{1} = \frac{2 \pi n}{3} - \frac{\pi}{9}$$
$$x_{2} = \frac{2 \pi n}{3} + \frac{\pi}{3}$$
Gráfica
Respuesta rápida [src]
     -pi 
x1 = ----
      9  
$$x_{1} = - \frac{\pi}{9}$$
     pi
x2 = --
     3 
$$x_{2} = \frac{\pi}{3}$$
x2 = pi/3
Suma y producto de raíces [src]
suma
  pi   pi
- -- + --
  9    3 
$$- \frac{\pi}{9} + \frac{\pi}{3}$$
=
2*pi
----
 9  
$$\frac{2 \pi}{9}$$
producto
-pi  pi
----*--
 9   3 
$$- \frac{\pi}{9} \frac{\pi}{3}$$
=
   2 
-pi  
-----
  27 
$$- \frac{\pi^{2}}{27}$$
-pi^2/27
Respuesta numérica [src]
x1 = -97.3893722612836
x2 = 16.4060949687467
x3 = 70.162235930172
x4 = -55.5014702134197
x5 = 28.2743338823081
x6 = 32.4631240870945
x7 = -15.707963267949
x8 = 72.2566310325652
x9 = 76.4454212373516
x10 = -90.4080552533063
x11 = 80.634211442138
x12 = 98.0875039620813
x13 = 49.9164166070378
x14 = 24.0855436775217
x15 = 87.6155284501153
x16 = -53.4070751110265
x17 = 26.1799387799149
x18 = -9.42477796076938
x19 = -11.5191730631626
x20 = 63.8790506229925
x21 = -21.9911485751286
x22 = -57.5958653158129
x23 = 52.010811709431
x24 = -75.7472895365539
x25 = 89.7099235525085
x26 = 47.8220215046446
x27 = 3.83972435438753
x28 = -88.3136601509131
x29 = -61.7846555205993
x30 = 91.8043186549017
x31 = 15.707963267949
x32 = 36.6519142918809
x33 = 40.8407044966673
x34 = 58.2939970166106
x35 = 8.02851455917392
x36 = -29.6705972839036
x37 = -0.349065850398866
x38 = 100.181899064475
x39 = -99.4837673636768
x40 = -24.0855436775217
x41 = 12.2173047639603
x42 = -50.6145483078356
x43 = -79.9360797413403
x44 = -42.2369678982628
x45 = -26.1799387799149
x46 = 35.2556508902855
x47 = 93.8987137572949
x48 = 19.8967534727354
x49 = -86.2192650485199
x50 = -65.9734457253857
x51 = -31.7649923862968
x52 = -38.0481776934764
x53 = -94.5968454580927
x54 = -47.1238898038469
x55 = 65.9734457253857
x56 = -13.6135681655558
x57 = -12.915436464758
x58 = -19.8967534727354
x59 = 5.93411945678072
x60 = 21.9911485751286
x61 = -77.8416846389471
x62 = -63.8790506229925
x63 = 43.6332312998582
x64 = 78.5398163397448
x65 = 30.3687289847013
x66 = 56.1996019142174
x67 = 74.3510261349584
x68 = 95.9931088596881
x69 = -957.487627644089
x70 = -84.1248699461267
x71 = -3.14159265358979
x72 = -33.85938748869
x73 = 10.1229096615671
x74 = 54.1052068118242
x75 = 45.7276264022514
x76 = -40.1425727958696
x77 = 14.3116998663535
x78 = -44.331363000656
x79 = -68.0678408277789
x80 = 60.3883921190038
x81 = -59.6902604182061
x82 = 1.74532925199433
x83 = 79.2379480405426
x84 = -73.6528944341607
x85 = -35.9537825910832
x86 = -82.0304748437335
x87 = -17.8023583703422
x88 = 68.0678408277789
x89 = 34.5575191894877
x90 = -27.5762021815104
x91 = -70.162235930172
x91 = -70.162235930172