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tg^2(pix/9)+4sin^2(pix/9)-6=0 la ecuación

El profesor se sorprenderá mucho al ver tu solución correcta😉

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Solución numérica:

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Solución

Ha introducido [src]
   2/pi*x\        2/pi*x\        
tan |----| + 4*sin |----| - 6 = 0
    \ 9  /         \ 9  /        
$$\left(4 \sin^{2}{\left(\frac{\pi x}{9} \right)} + \tan^{2}{\left(\frac{\pi x}{9} \right)}\right) - 6 = 0$$
Gráfica
Respuesta numérica [src]
x1 = -87.0
x2 = -6.0
x3 = 48.0
x4 = 87.0
x5 = 78.0
x6 = 33.0
x7 = -93.0
x8 = 30.0
x9 = 60.0
x10 = -30.0
x11 = 84.0
x12 = -57.0
x13 = -42.0
x14 = 21.0
x15 = 123.0
x16 = -78.0
x17 = 57.0
x18 = -75.0
x19 = 15.0
x20 = -3.0
x21 = -51.0
x22 = 102.0
x23 = -96.0
x24 = -66.0
x25 = 96.0
x26 = 51.0
x27 = 66.0
x28 = 24.0
x29 = -84.0
x30 = 69.0
x31 = 39.0
x32 = 6.0
x33 = -33.0
x34 = -60.0
x35 = -12.0
x36 = 93.0
x37 = -21.0
x38 = -15.0
x39 = -24.0
x40 = 42.0
x41 = -105.0
x42 = -69.0
x43 = 3.0
x44 = 75.0
x45 = 105.0
x46 = -48.0
x47 = -39.0
x48 = 12.0
x48 = 12.0