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tgactga-(ctgasina)^2 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
                              2    
tan(acot(a)) - (cot(a)*sin(a))  = 0
$$- \left(\sin{\left(a \right)} \cot{\left(a \right)}\right)^{2} + \tan{\left(\operatorname{acot}{\left(a \right)} \right)} = 0$$
Solución detallada
Tenemos la ecuación
$$- \left(\sin{\left(a \right)} \cot{\left(a \right)}\right)^{2} + \tan{\left(\operatorname{acot}{\left(a \right)} \right)} = 0$$
cambiamos
$$\sin^{2}{\left(a \right)} - 2 + \frac{1}{a} = 0$$
$$- \sin^{2}{\left(a \right)} \cot^{2}{\left(a \right)} + \tan{\left(\operatorname{acot}{\left(a \right)} \right)} - 1 = 0$$
Sustituimos
$$w = \cot{\left(a \right)}$$
Es la ecuación de la forma
a*w^2 + b*w + c = 0

La ecuación cuadrática puede ser resuelta
con la ayuda del discriminante.
Las raíces de la ecuación cuadrática:
$$w_{1} = \frac{\sqrt{D} - b}{2 a}$$
$$w_{2} = \frac{- \sqrt{D} - b}{2 a}$$
donde D = b^2 - 4*a*c es el discriminante.
Como
$$a = - \sin^{2}{\left(a \right)}$$
$$b = 0$$
$$c = -1 + \frac{1}{a}$$
, entonces
D = b^2 - 4 * a * c = 

(0)^2 - 4 * (-sin(a)^2) * (-1 + 1/a) = 4*sin(a)^2*(-1 + 1/a)

La ecuación tiene dos raíces.
w1 = (-b + sqrt(D)) / (2*a)

w2 = (-b - sqrt(D)) / (2*a)

o
$$w_{1} = - \frac{\sqrt{\left(-1 + \frac{1}{a}\right) \sin^{2}{\left(a \right)}}}{\sin^{2}{\left(a \right)}}$$
$$w_{2} = \frac{\sqrt{\left(-1 + \frac{1}{a}\right) \sin^{2}{\left(a \right)}}}{\sin^{2}{\left(a \right)}}$$
hacemos cambio inverso
$$\cot{\left(a \right)} = w$$
sustituimos w:
Gráfica
Respuesta numérica [src]
a1 = 86.2859349849823
a2 = 48.5506721586076
a3 = 33.1612615727238
a4 = 76.8547029362575
a5 = 98.8594230385171
a6 = 6297.3098722807
a7 = 89.6412079919187
a8 = 70.5665096113623
a9 = 10.6846609814927
a10 = 92.5728611208867
a11 = 2.29226938383243
a12 = 11.2976607697728
a13 = 20.1959543836832
a14 = 372.330577239688
a15 = 30.0286456275586
a16 = 79.9985740211556
a17 = 67.666110123532
a18 = 5065.80410346807
a19 = 99.0608113313565
a20 = 8.21047717480899
a21 = 64.5274612628354
a22 = 17.0340307750505
a23 = 117.717425630058
a24 = 95.9208583506573
a25 = 54.8424241174466
a26 = 58.2508652831756
a27 = 42.2570542214533
a28 = 61.3890363529688
a29 = 77.083166813166
a30 = 36.2950751317924
a31 = 83.3619511936861
a32 = 39.4298420675678
a33 = 32.8112460498774
a34 = 23.768526803947
a35 = 64.2775939079405
a36 = 29.6604662589867
a37 = 73.9439827469436
a38 = 55.1129838382536
a39 = 17.5200019893448
a40 = 45.7015608937668
a41 = 26.5080675515955
a42 = 884.32469818012
a43 = 61.1328077371396
a44 = 51.9754352819038
a45 = 83.1423139986853
a46 = 39.1093145564464
a47 = 4.20283806836233
a47 = 4.20283806836233