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cos²(3*x-5pi/4)=1 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
   2/      5*pi\    
cos |3*x - ----| = 1
    \       4  /    
$$\cos^{2}{\left(3 x - \frac{5 \pi}{4} \right)} = 1$$
Solución detallada
Tenemos la ecuación
$$\cos^{2}{\left(3 x - \frac{5 \pi}{4} \right)} = 1$$
cambiamos
$$\frac{\sin{\left(6 x \right)}}{2} - \frac{1}{2} = 0$$
$$\cos^{2}{\left(3 x - \frac{5 \pi}{4} \right)} - 1 = 0$$
Sustituimos
$$w = \sin{\left(3 x + \frac{\pi}{4} \right)}$$
Tenemos la ecuación
$$\cos^{2}{\left(3 x - \frac{5 \pi}{4} \right)} - 1 = 0$$
Ya que la potencia en la ecuación es igual a = 2 - contiene un número par 2 en el numerador, entonces
la ecuación tendrá dos raíces reales.
Extraigamos la raíz de potencia 2 de las dos partes de la ecuación:
Obtenemos:
$$\sqrt{\left(0 w + \sin{\left(3 x + \frac{\pi}{4} \right)}\right)^{2}} = \sqrt{1}$$
$$\sqrt{\left(0 w + \sin{\left(3 x + \frac{\pi}{4} \right)}\right)^{2}} = \left(-1\right) \sqrt{1}$$
o
$$\sin{\left(3 x + \frac{\pi}{4} \right)} = 1$$
$$\sin{\left(3 x + \frac{\pi}{4} \right)} = -1$$
Abrimos los paréntesis en el miembro izquierdo de la ecuación
sin3*x+pi/4 = 1

Esta ecuación no tiene soluciones
Abrimos los paréntesis en el miembro izquierdo de la ecuación
sin3*x+pi/4 = -1

Esta ecuación no tiene soluciones
o

hacemos cambio inverso
$$\sin{\left(3 x + \frac{\pi}{4} \right)} = w$$
Tenemos la ecuación
$$\sin{\left(3 x + \frac{\pi}{4} \right)} = w$$
es la ecuación trigonométrica más simple
Esta ecuación se reorganiza en
$$3 x + \frac{\pi}{4} = 2 \pi n + \operatorname{asin}{\left(w \right)}$$
$$3 x + \frac{\pi}{4} = 2 \pi n - \operatorname{asin}{\left(w \right)} + \pi$$
O
$$3 x + \frac{\pi}{4} = 2 \pi n + \operatorname{asin}{\left(w \right)}$$
$$3 x + \frac{\pi}{4} = 2 \pi n - \operatorname{asin}{\left(w \right)} + \pi$$
, donde n es cualquier número entero
Transportemos
$$\frac{\pi}{4}$$
al miembro derecho de la ecuación
con el signo opuesto, en total:
$$3 x = 2 \pi n + \operatorname{asin}{\left(w \right)} - \frac{\pi}{4}$$
$$3 x = 2 \pi n - \operatorname{asin}{\left(w \right)} + \frac{3 \pi}{4}$$
Dividamos ambos miembros de la ecuación obtenida en
$$3$$
sustituimos w:
Gráfica
Respuesta rápida [src]
     -pi 
x1 = ----
      4  
$$x_{1} = - \frac{\pi}{4}$$
     pi
x2 = --
     12
$$x_{2} = \frac{\pi}{12}$$
     5*pi
x3 = ----
      12 
$$x_{3} = \frac{5 \pi}{12}$$
x3 = 5*pi/12
Suma y producto de raíces [src]
suma
  pi   pi   5*pi
- -- + -- + ----
  4    12    12 
$$\left(- \frac{\pi}{4} + \frac{\pi}{12}\right) + \frac{5 \pi}{12}$$
=
pi
--
4 
$$\frac{\pi}{4}$$
producto
-pi  pi 5*pi
----*--*----
 4   12  12 
$$\frac{5 \pi}{12} \cdot - \frac{\pi}{4} \frac{\pi}{12}$$
=
     3
-5*pi 
------
 576  
$$- \frac{5 \pi^{3}}{576}$$
-5*pi^3/576
Respuesta numérica [src]
x1 = 59.9520598481687
x2 = 22.2529479607571
x3 = 94.5095789779178
x4 = -41.62610272373
x5 = 79.8488133554185
x6 = 84.0376034179138
x7 = -98.174770348449
x8 = -93.9859802388653
x9 = 40.05530620807
x10 = 50.5272818759395
x11 = -76.1836217744616
x12 = 42.149701543678
x13 = 88.2263937072014
x14 = -1.8325956303714
x15 = 37.9609112670449
x16 = -30.1069295278938
x17 = -43.7204977825881
x18 = 6.5449848141863
x19 = -78.2780169853537
x20 = -32.2013246284748
x21 = 20.1585529574804
x22 = -100.269165531996
x23 = -15.4461636998964
x24 = -85.6083998783531
x25 = -89.797189973996
x26 = 13.8753676266739
x27 = -50.0036830653347
x28 = -8.11578095040642
x29 = -10.2101760567131
x30 = -96.0803752628436
x31 = -54.1924732011039
x32 = 18.0641575904069
x33 = 24.3473430106795
x34 = -17.5405590488288
x35 = 0.261799379333194
x36 = 28.5361333386207
x37 = -67.8060413893714
x38 = -52.0980781057903
x39 = 90.3207887476935
x40 = -48.9564853809923
x41 = 4.45058952366422
x42 = 130.114295757992
x43 = -92.9387829749902
x44 = -37.4373122668668
x45 = 77.7544182162793
x46 = -12.3045714094311
x47 = -21.7293492017758
x48 = -71.9948316512416
x49 = 48.4328866713396
x50 = -6.02138589730989
x51 = 62.0464548168765
x52 = 44.2440965425203
x53 = 2.35619443223801
x54 = -3.92699098017885
x55 = -83.5140047581305
x56 = -87.7027949433722
x57 = 26.4417380971056
x58 = 68.3296401684154
x59 = 13.8753675471005
x60 = -45.814892803953
x61 = 92.41518382174
x62 = 99.7455667784648
x63 = -74.0892266841028
x64 = -61.5228561900619
x65 = -65.7116463631172
x66 = 66.2352451246547
x67 = -23.8237442176309
x68 = -56.2868684488565
x69 = 57.8576647795972
x70 = -39.531707620165
x71 = 46.3384915894085
x72 = 9.68657715106654
x73 = -19.6349541459037
x74 = -58.3812632463393
x75 = 72.5184304232893
x76 = 75.6600230667895
x77 = 33.7721210833439
x78 = -63.6172513012213
x79 = 11.7809725139856
x80 = 47.3856893488309
x81 = 70.424035246248
x82 = 15.9697626852522
x83 = 55.7632696509651
x84 = 35.8665162033444
x85 = -33.2485222538391
x86 = -34.2957199248261
x87 = 64.1408501103489
x88 = 81.9432084286987
x89 = -28.012534480777
x89 = -28.012534480777