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3*sin^2(x)-2*cos(x)+2=0 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
     2                      
3*sin (x) - 2*cos(x) + 2 = 0
$$\left(3 \sin^{2}{\left(x \right)} - 2 \cos{\left(x \right)}\right) + 2 = 0$$
Solución detallada
Tenemos la ecuación
$$\left(3 \sin^{2}{\left(x \right)} - 2 \cos{\left(x \right)}\right) + 2 = 0$$
cambiamos
$$- 3 \cos^{2}{\left(x \right)} - 2 \cos{\left(x \right)} + 5 = 0$$
$$- 3 \cos^{2}{\left(x \right)} - 2 \cos{\left(x \right)} + 5 = 0$$
Sustituimos
$$w = \cos{\left(x \right)}$$
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
$$a = -3$$
$$b = -2$$
$$c = 5$$
, entonces
D = b^2 - 4 * a * c = 

(-2)^2 - 4 * (-3) * (5) = 64

Como D > 0 la ecuación tiene dos raíces.
w1 = (-b + sqrt(D)) / (2*a)

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

o
$$w_{1} = - \frac{5}{3}$$
$$w_{2} = 1$$
hacemos cambio inverso
$$\cos{\left(x \right)} = w$$
Tenemos la ecuación
$$\cos{\left(x \right)} = w$$
es la ecuación trigonométrica más simple
Esta ecuación se reorganiza en
$$x = \pi n + \operatorname{acos}{\left(w \right)}$$
$$x = \pi n + \operatorname{acos}{\left(w \right)} - \pi$$
O
$$x = \pi n + \operatorname{acos}{\left(w \right)}$$
$$x = \pi n + \operatorname{acos}{\left(w \right)} - \pi$$
, donde n es cualquier número entero
sustituimos w:
$$x_{1} = \pi n + \operatorname{acos}{\left(w_{1} \right)}$$
$$x_{1} = \pi n + \operatorname{acos}{\left(- \frac{5}{3} \right)}$$
$$x_{1} = \pi n + \operatorname{acos}{\left(- \frac{5}{3} \right)}$$
$$x_{2} = \pi n + \operatorname{acos}{\left(w_{2} \right)}$$
$$x_{2} = \pi n + \operatorname{acos}{\left(1 \right)}$$
$$x_{2} = \pi n$$
$$x_{3} = \pi n + \operatorname{acos}{\left(w_{1} \right)} - \pi$$
$$x_{3} = \pi n - \pi + \operatorname{acos}{\left(- \frac{5}{3} \right)}$$
$$x_{3} = \pi n - \pi + \operatorname{acos}{\left(- \frac{5}{3} \right)}$$
$$x_{4} = \pi n + \operatorname{acos}{\left(w_{2} \right)} - \pi$$
$$x_{4} = \pi n - \pi + \operatorname{acos}{\left(1 \right)}$$
$$x_{4} = \pi n - \pi$$
Gráfica
Respuesta rápida [src]
x1 = 0
$$x_{1} = 0$$
x2 = 2*im(atanh(2)) - 2*I*re(atanh(2))
$$x_{2} = 2 \operatorname{im}{\left(\operatorname{atanh}{\left(2 \right)}\right)} - 2 i \operatorname{re}{\left(\operatorname{atanh}{\left(2 \right)}\right)}$$
x3 = -2*im(atanh(2)) + 2*I*re(atanh(2))
$$x_{3} = - 2 \operatorname{im}{\left(\operatorname{atanh}{\left(2 \right)}\right)} + 2 i \operatorname{re}{\left(\operatorname{atanh}{\left(2 \right)}\right)}$$
x3 = -2*im(atanh(2)) + 2*i*re(atanh(2))
Suma y producto de raíces [src]
suma
2*im(atanh(2)) - 2*I*re(atanh(2)) + -2*im(atanh(2)) + 2*I*re(atanh(2))
$$\left(2 \operatorname{im}{\left(\operatorname{atanh}{\left(2 \right)}\right)} - 2 i \operatorname{re}{\left(\operatorname{atanh}{\left(2 \right)}\right)}\right) + \left(- 2 \operatorname{im}{\left(\operatorname{atanh}{\left(2 \right)}\right)} + 2 i \operatorname{re}{\left(\operatorname{atanh}{\left(2 \right)}\right)}\right)$$
=
0
$$0$$
producto
0*(2*im(atanh(2)) - 2*I*re(atanh(2)))*(-2*im(atanh(2)) + 2*I*re(atanh(2)))
$$\left(- 2 \operatorname{im}{\left(\operatorname{atanh}{\left(2 \right)}\right)} + 2 i \operatorname{re}{\left(\operatorname{atanh}{\left(2 \right)}\right)}\right) 0 \left(2 \operatorname{im}{\left(\operatorname{atanh}{\left(2 \right)}\right)} - 2 i \operatorname{re}{\left(\operatorname{atanh}{\left(2 \right)}\right)}\right)$$
=
0
$$0$$
0
Respuesta numérica [src]
x1 = -31.4159266196534
x2 = -251.327412273949
x3 = -69.115038643136
x4 = 12.566370114504
x5 = 94.2477796093524
x6 = 75.3982235560588
x7 = 81.6814094553991
x8 = -75.3982235939661
x9 = -12.5663703510437
x10 = -62.831853345356
x11 = 18.849555664849
x12 = 0.0
x13 = -25.1327410787185
x14 = 81.6814091796372
x15 = -100.530964659879
x16 = 75.3982239567878
x17 = -18.8495561981144
x18 = 12.5663704494723
x19 = -25.1327414892758
x20 = 188.495559563197
x21 = 50.2654824463453
x22 = -50.265482293023
x23 = -62.831852783388
x24 = 100.530964764843
x25 = 31.415926803001
x26 = -87.9645943587335
x27 = -94.2477794510094
x28 = -31.4159267079561
x29 = 69.1150386618644
x30 = 25.1327409497728
x31 = 6.28318528424044
x32 = -6.28318513525716
x33 = 43.9822971694365
x34 = 69.1150379182055
x35 = -31.4159268178552
x36 = -37.6991118771797
x37 = -56.5486678045987
x38 = 62.8318528192291
x39 = 18.8495560486233
x40 = 25.132741513973
x41 = 69.1150380982552
x42 = 31.4159264316657
x43 = -87.9645946197325
x44 = -75.3982238652115
x45 = 94.2477791537892
x46 = -56.5486675053392
x47 = 56.5486678237887
x48 = -12.5663706887756
x49 = 37.6991120222947
x50 = -43.9822971745689
x51 = -69.1150382090074
x52 = -81.6814090380623
x53 = -18.8495556344567
x54 = 87.9645943357949
x55 = 56.5486676070721
x56 = 62.83185317253
x56 = 62.83185317253