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(3*cos(2*x)+5*cos(x)-1)/(-ctg(x))^0.5=0 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
3*cos(2*x) + 5*cos(x) - 1    
------------------------- = 0
         _________           
       \/ -cot(x)            
$$\frac{\left(5 \cos{\left(x \right)} + 3 \cos{\left(2 x \right)}\right) - 1}{\sqrt{- \cot{\left(x \right)}}} = 0$$
Gráfica
Respuesta rápida [src]
     -pi 
x1 = ----
      3  
$$x_{1} = - \frac{\pi}{3}$$
     pi
x2 = --
     3 
$$x_{2} = \frac{\pi}{3}$$
               /      ___\
               |4   \/ 7 |
x3 = pi + I*log|- - -----|
               \3     3  /
$$x_{3} = \pi + i \log{\left(\frac{4}{3} - \frac{\sqrt{7}}{3} \right)}$$
               /      ___\
               |4   \/ 7 |
x4 = pi + I*log|- + -----|
               \3     3  /
$$x_{4} = \pi + i \log{\left(\frac{\sqrt{7}}{3} + \frac{4}{3} \right)}$$
x4 = pi + i*log(sqrt(7)/3 + 4/3)
Suma y producto de raíces [src]
suma
                      /      ___\             /      ___\
  pi   pi             |4   \/ 7 |             |4   \/ 7 |
- -- + -- + pi + I*log|- - -----| + pi + I*log|- + -----|
  3    3              \3     3  /             \3     3  /
$$\left(\left(- \frac{\pi}{3} + \frac{\pi}{3}\right) + \left(\pi + i \log{\left(\frac{4}{3} - \frac{\sqrt{7}}{3} \right)}\right)\right) + \left(\pi + i \log{\left(\frac{\sqrt{7}}{3} + \frac{4}{3} \right)}\right)$$
=
            /      ___\        /      ___\
            |4   \/ 7 |        |4   \/ 7 |
2*pi + I*log|- - -----| + I*log|- + -----|
            \3     3  /        \3     3  /
$$2 \pi + i \log{\left(\frac{4}{3} - \frac{\sqrt{7}}{3} \right)} + i \log{\left(\frac{\sqrt{7}}{3} + \frac{4}{3} \right)}$$
producto
        /          /      ___\\ /          /      ___\\
-pi  pi |          |4   \/ 7 || |          |4   \/ 7 ||
----*--*|pi + I*log|- - -----||*|pi + I*log|- + -----||
 3   3  \          \3     3  // \          \3     3  //
$$- \frac{\pi}{3} \frac{\pi}{3} \left(\pi + i \log{\left(\frac{4}{3} - \frac{\sqrt{7}}{3} \right)}\right) \left(\pi + i \log{\left(\frac{\sqrt{7}}{3} + \frac{4}{3} \right)}\right)$$
=
     /          /      ___\\ /          /      ___\\ 
   2 |          |4   \/ 7 || |          |4   \/ 7 || 
-pi *|pi + I*log|- - -----||*|pi + I*log|- + -----|| 
     \          \3     3  // \          \3     3  // 
-----------------------------------------------------
                          9                          
$$- \frac{\pi^{2} \left(\pi + i \log{\left(\frac{4}{3} - \frac{\sqrt{7}}{3} \right)}\right) \left(\pi + i \log{\left(\frac{\sqrt{7}}{3} + \frac{4}{3} \right)}\right)}{9}$$
-pi^2*(pi + i*log(4/3 - sqrt(7)/3))*(pi + i*log(4/3 + sqrt(7)/3))/9
Respuesta numérica [src]
x1 = -61.7846555205993
x2 = 17.8023583703422
x3 = -7.33038285837618
x4 = 63.8790506229925
x5 = 59.6902604182061 + 0.795365461223906*i
x6 = -26.1799387799149
x7 = 70.162235930172
x8 = -99.4837673636768
x9 = -17.8023583703422
x10 = -51.3126800086333
x11 = 24.0855436775217
x12 = 68.0678408277789
x13 = -13.6135681655558
x14 = 32.4631240870945
x15 = -57.5958653158129
x16 = 74.3510261349584
x17 = -74.3510261349584
x18 = -55.5014702134197
x19 = -30.3687289847013
x20 = -68.0678408277789
x21 = 76.4454212373516
x22 = -95.2949771588904
x23 = 30.3687289847013
x24 = -19.8967534727354
x25 = 61.7846555205993
x26 = -11.5191730631626
x27 = 36.6519142918809
x28 = -70.162235930172
x29 = -24.0855436775217
x30 = 80.634211442138
x31 = -63.8790506229925
x32 = 26.1799387799149
x33 = 19.8967534727354
x33 = 19.8967534727354