log(sqrt(2)*sin(x),cos(x)+1)=2 la ecuación
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Solución
Solución detallada
Tenemos la ecuación
log ( 2 sin ( x ) ) = 2 \log{\left(\sqrt{2} \sin{\left(x \right)} \right)} = 2 log ( 2 sin ( x ) ) = 2 cambiamos
log ( 2 sin ( x ) ) log ( cos ( x ) + 1 ) − 2 = 0 \frac{\log{\left(\sqrt{2} \sin{\left(x \right)} \right)}}{\log{\left(\cos{\left(x \right)} + 1 \right)}} - 2 = 0 log ( cos ( x ) + 1 ) log ( 2 sin ( x ) ) − 2 = 0 log ( 2 sin ( x ) ) − 2 = 0 \log{\left(\sqrt{2} \sin{\left(x \right)} \right)} - 2 = 0 log ( 2 sin ( x ) ) − 2 = 0 Sustituimos
w = sin ( x ) w = \sin{\left(x \right)} w = sin ( x ) Tenemos la ecuación
log ( 2 w ) log ( cos ( x ) + 1 ) − 2 = 0 \frac{\log{\left(\sqrt{2} w \right)}}{\log{\left(\cos{\left(x \right)} + 1 \right)}} - 2 = 0 log ( cos ( x ) + 1 ) log ( 2 w ) − 2 = 0 log ( 2 w ) log ( cos ( x ) + 1 ) = 2 \frac{\log{\left(\sqrt{2} w \right)}}{\log{\left(\cos{\left(x \right)} + 1 \right)}} = 2 log ( cos ( x ) + 1 ) log ( 2 w ) = 2 Devidimos ambás partes de la ecuación por el multiplicador de log =1/log(1 + cos(x))
log ( 2 w ) = 2 log ( cos ( x ) + 1 ) \log{\left(\sqrt{2} w \right)} = 2 \log{\left(\cos{\left(x \right)} + 1 \right)} log ( 2 w ) = 2 log ( cos ( x ) + 1 ) Es la ecuación de la forma:
log(v)=p Por definición log
v=e^p entonces
2 w = e 2 1 log ( cos ( x ) + 1 ) \sqrt{2} w = e^{\frac{2}{\frac{1}{\log{\left(\cos{\left(x \right)} + 1 \right)}}}} 2 w = e l o g ( c o s ( x ) + 1 ) 1 2 simplificamos
2 w = ( cos ( x ) + 1 ) 2 \sqrt{2} w = \left(\cos{\left(x \right)} + 1\right)^{2} 2 w = ( cos ( x ) + 1 ) 2 w = 2 ( cos ( x ) + 1 ) 2 2 w = \frac{\sqrt{2} \left(\cos{\left(x \right)} + 1\right)^{2}}{2} w = 2 2 ( cos ( x ) + 1 ) 2 hacemos cambio inverso
sin ( x ) = w \sin{\left(x \right)} = w sin ( x ) = w Tenemos la ecuación
sin ( x ) = w \sin{\left(x \right)} = w sin ( x ) = w es la ecuación trigonométrica más simple
Esta ecuación se reorganiza en
x = 2 π n + asin ( w ) x = 2 \pi n + \operatorname{asin}{\left(w \right)} x = 2 πn + asin ( w ) x = 2 π n − asin ( w ) + π x = 2 \pi n - \operatorname{asin}{\left(w \right)} + \pi x = 2 πn − asin ( w ) + π O
x = 2 π n + asin ( w ) x = 2 \pi n + \operatorname{asin}{\left(w \right)} x = 2 πn + asin ( w ) x = 2 π n − asin ( w ) + π x = 2 \pi n - \operatorname{asin}{\left(w \right)} + \pi x = 2 πn − asin ( w ) + π , donde n es cualquier número entero
sustituimos w:
Gráfica
0 -80 -60 -40 -20 20 40 60 80 -100 100 -2000 2000
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x1 = 2*atan\CRootOf\x + 2*x + x - 2, 1//
x 1 = 2 atan ( CRootOf ( x 6 + 2 x 4 + x 2 − 2 , 1 ) ) x_{1} = 2 \operatorname{atan}{\left(\operatorname{CRootOf} {\left(x^{6} + 2 x^{4} + x^{2} - 2, 1\right)} \right)} x 1 = 2 atan ( CRootOf ( x 6 + 2 x 4 + x 2 − 2 , 1 ) )
Eq(x1, 2*atan(CRootOf(x^6 + 2*x^4 + x^2 - 2, 1)))
Suma y producto de raíces
[src]
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2*atan\CRootOf\x + 2*x + x - 2, 1//
2 atan ( CRootOf ( x 6 + 2 x 4 + x 2 − 2 , 1 ) ) 2 \operatorname{atan}{\left(\operatorname{CRootOf} {\left(x^{6} + 2 x^{4} + x^{2} - 2, 1\right)} \right)} 2 atan ( CRootOf ( x 6 + 2 x 4 + x 2 − 2 , 1 ) )
/ / 6 4 2 \\
2*atan\CRootOf\x + 2*x + x - 2, 1//
2 atan ( CRootOf ( x 6 + 2 x 4 + x 2 − 2 , 1 ) ) 2 \operatorname{atan}{\left(\operatorname{CRootOf} {\left(x^{6} + 2 x^{4} + x^{2} - 2, 1\right)} \right)} 2 atan ( CRootOf ( x 6 + 2 x 4 + x 2 − 2 , 1 ) )
/ / 6 4 2 \\
2*atan\CRootOf\x + 2*x + x - 2, 1//
2 atan ( CRootOf ( x 6 + 2 x 4 + x 2 − 2 , 1 ) ) 2 \operatorname{atan}{\left(\operatorname{CRootOf} {\left(x^{6} + 2 x^{4} + x^{2} - 2, 1\right)} \right)} 2 atan ( CRootOf ( x 6 + 2 x 4 + x 2 − 2 , 1 ) )
/ / 6 4 2 \\
2*atan\CRootOf\x + 2*x + x - 2, 1//
2 atan ( CRootOf ( x 6 + 2 x 4 + x 2 − 2 , 1 ) ) 2 \operatorname{atan}{\left(\operatorname{CRootOf} {\left(x^{6} + 2 x^{4} + x^{2} - 2, 1\right)} \right)} 2 atan ( CRootOf ( x 6 + 2 x 4 + x 2 − 2 , 1 ) )
2*atan(CRootOf(x^6 + 2*x^4 + x^2 - 2, 1))