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cos(2*x)/sgrtx=sqrt2/2 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
             ___
cos(2*x)   \/ 2 
-------- = -----
   ___       2  
 \/ x           
$$\frac{\cos{\left(2 x \right)}}{\sqrt{x}} = \frac{\sqrt{2}}{2}$$
Gráfica
Respuesta numérica [src]
x1 = -101.313112517442 - 1.33031141869112*i
x2 = -32.1934235155184 + 1.04894292787486*i
x3 = -7.04689141050256 + 0.694587014282778*i
x4 = -79.321262219803 - 1.26981694440196*i
x5 = -3.89743574567916 + 0.569605717002464*i
x6 = -63.6125485094355 + 1.21541822244121*i
x7 = -19.6236749895063 + 0.930004466336792*i
x8 = -47.9034303978045 + 1.14579118650706*i
x9 = -54.1871458538531 + 1.17600556308272*i
x10 = -10.1927752352538 + 0.777212030034673*i
x11 = 15.6935643475482 + 0.845265055737147*i
x12 = -41.6195829476401 + 1.11141588651792*i
x13 = -0.734883916230155 - 0.293310977748217*i
x14 = -13.3371179232241 + 0.839125727245302*i
x15 = -66.7543154479179 + 1.22728623824839*i
x16 = -0.734883916230155 + 0.293310977748217*i
x17 = -25.9088792707152 + 0.996486171461409*i
x18 = -29.0512111027641 - 1.02408862069099*i
x19 = -13.3371179232241 - 0.839125727245302*i
x20 = -69.8960688339615 + 1.23861626533387*i
x21 = -22.7663877146734 + 0.965450797650358*i
x21 = -22.7663877146734 + 0.965450797650358*i