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(ctg)x/3<=-sqrt3 desigualdades

En la desigualdad la incógnita

Solución

Ha introducido [src]
cot(x)*x       ___
-------- <= -\/ 3 
   3              
$$\frac{x \cot{\left(x \right)}}{3} \leq - \sqrt{3}$$
(x*cot(x))/3 <= -sqrt(3)
Solución detallada
Se da la desigualdad:
$$\frac{x \cot{\left(x \right)}}{3} \leq - \sqrt{3}$$
Para resolver esta desigualdad primero hay que resolver la ecuación correspondiente:
$$\frac{x \cot{\left(x \right)}}{3} = - \sqrt{3}$$
Resolvemos:
Tenemos la ecuación
$$\frac{x \cot{\left(x \right)}}{3} = - \sqrt{3}$$
cambiamos
$$\frac{x \cot{\left(x \right)}}{3} - 1 + \sqrt{3} = 0$$
$$\frac{x \cot{\left(x \right)}}{3} - 1 + \sqrt{3} = 0$$
Sustituimos
$$w = \cot{\left(x \right)}$$
Abrimos los paréntesis en el miembro izquierdo de la ecuación
-1 + sqrt3 + w*x/3 = 0

Transportamos los términos libres (sin w)
del miembro izquierdo al derecho, obtenemos:
$$\frac{w x}{3} + \sqrt{3} = 1$$
Dividamos ambos miembros de la ecuación en (sqrt(3) + w*x/3)/w
w = 1 / ((sqrt(3) + w*x/3)/w)

Obtenemos la respuesta: w = 3*(1 - sqrt(3))/x
hacemos cambio inverso
$$\cot{\left(x \right)} = w$$
sustituimos w:
$$x_{1} = -17.5663599498268$$
$$x_{2} = 58.2084960384468$$
$$x_{3} = -95.8727214040797$$
$$x_{4} = -86.4538289655055$$
$$x_{5} = 17.5663599498268$$
$$x_{6} = 33.1422402299566$$
$$x_{7} = 51.9359961028683$$
$$x_{8} = 5.47194116424952$$
$$x_{9} = 20.6666731902081$$
$$x_{10} = -55.0719450173938$$
$$x_{11} = 61.3455580364299$$
$$x_{12} = 42.5330657930663$$
$$x_{13} = -45.6663912429456$$
$$x_{14} = 89.5933228253095$$
$$x_{15} = -89.5933228253095$$
$$x_{16} = -77.0363686410871$$
$$x_{17} = -70.7591374966673$$
$$x_{18} = -67.6209337051216$$
$$x_{19} = -11.4224997329587$$
$$x_{20} = -83.3144925727197$$
$$x_{21} = -58.2084960384468$$
$$x_{22} = 55.0719450173938$$
$$x_{23} = -64.4830573281395$$
$$x_{24} = 36.2706080271563$$
$$x_{25} = 30.0165410942153$$
$$x_{26} = -42.5330657930663$$
$$x_{27} = -99.0126001978345$$
$$x_{28} = -14.4816677478834$$
$$x_{29} = -20.6666731902081$$
$$x_{30} = 92.7329582495637$$
$$x_{31} = 73.8976273669175$$
$$x_{32} = 14.4816677478834$$
$$x_{33} = 26.8943917751677$$
$$x_{34} = 67.6209337051216$$
$$x_{35} = -30.0165410942153$$
$$x_{36} = 48.8007633260567$$
$$x_{37} = -33.1422402299566$$
$$x_{38} = 99.0126001978345$$
$$x_{39} = -51.9359961028683$$
$$x_{40} = 2.66733838749595$$
$$x_{41} = 45.6663912429456$$
$$x_{42} = 83.3144925727197$$
$$x_{43} = 95.8727214040797$$
$$x_{44} = -80.1753320185758$$
$$x_{45} = 86.4538289655055$$
$$x_{46} = -26.8943917751677$$
$$x_{47} = -61.3455580364299$$
$$x_{48} = -48.8007633260567$$
$$x_{49} = 11.4224997329587$$
$$x_{50} = 39.4010301009269$$
$$x_{51} = 70.7591374966673$$
$$x_{52} = -73.8976273669175$$
$$x_{53} = -36.2706080271563$$
$$x_{54} = 64.4830573281395$$
$$x_{55} = -23.7770983831808$$
$$x_{56} = -39.4010301009269$$
$$x_{57} = -5.47194116424952$$
$$x_{58} = 8.40755575235436$$
$$x_{59} = 77.0363686410871$$
$$x_{60} = -92.7329582495637$$
$$x_{61} = -8.40755575235436$$
$$x_{62} = 80.1753320185758$$
$$x_{63} = 23.7770983831808$$
$$x_{1} = -17.5663599498268$$
$$x_{2} = 58.2084960384468$$
$$x_{3} = -95.8727214040797$$
$$x_{4} = -86.4538289655055$$
$$x_{5} = 17.5663599498268$$
$$x_{6} = 33.1422402299566$$
$$x_{7} = 51.9359961028683$$
$$x_{8} = 5.47194116424952$$
$$x_{9} = 20.6666731902081$$
$$x_{10} = -55.0719450173938$$
$$x_{11} = 61.3455580364299$$
$$x_{12} = 42.5330657930663$$
$$x_{13} = -45.6663912429456$$
$$x_{14} = 89.5933228253095$$
$$x_{15} = -89.5933228253095$$
$$x_{16} = -77.0363686410871$$
$$x_{17} = -70.7591374966673$$
$$x_{18} = -67.6209337051216$$
$$x_{19} = -11.4224997329587$$
$$x_{20} = -83.3144925727197$$
$$x_{21} = -58.2084960384468$$
$$x_{22} = 55.0719450173938$$
$$x_{23} = -64.4830573281395$$
$$x_{24} = 36.2706080271563$$
$$x_{25} = 30.0165410942153$$
$$x_{26} = -42.5330657930663$$
$$x_{27} = -99.0126001978345$$
$$x_{28} = -14.4816677478834$$
$$x_{29} = -20.6666731902081$$
$$x_{30} = 92.7329582495637$$
$$x_{31} = 73.8976273669175$$
$$x_{32} = 14.4816677478834$$
$$x_{33} = 26.8943917751677$$
$$x_{34} = 67.6209337051216$$
$$x_{35} = -30.0165410942153$$
$$x_{36} = 48.8007633260567$$
$$x_{37} = -33.1422402299566$$
$$x_{38} = 99.0126001978345$$
$$x_{39} = -51.9359961028683$$
$$x_{40} = 2.66733838749595$$
$$x_{41} = 45.6663912429456$$
$$x_{42} = 83.3144925727197$$
$$x_{43} = 95.8727214040797$$
$$x_{44} = -80.1753320185758$$
$$x_{45} = 86.4538289655055$$
$$x_{46} = -26.8943917751677$$
$$x_{47} = -61.3455580364299$$
$$x_{48} = -48.8007633260567$$
$$x_{49} = 11.4224997329587$$
$$x_{50} = 39.4010301009269$$
$$x_{51} = 70.7591374966673$$
$$x_{52} = -73.8976273669175$$
$$x_{53} = -36.2706080271563$$
$$x_{54} = 64.4830573281395$$
$$x_{55} = -23.7770983831808$$
$$x_{56} = -39.4010301009269$$
$$x_{57} = -5.47194116424952$$
$$x_{58} = 8.40755575235436$$
$$x_{59} = 77.0363686410871$$
$$x_{60} = -92.7329582495637$$
$$x_{61} = -8.40755575235436$$
$$x_{62} = 80.1753320185758$$
$$x_{63} = 23.7770983831808$$
Las raíces dadas
$$x_{27} = -99.0126001978345$$
$$x_{3} = -95.8727214040797$$
$$x_{60} = -92.7329582495637$$
$$x_{15} = -89.5933228253095$$
$$x_{4} = -86.4538289655055$$
$$x_{20} = -83.3144925727197$$
$$x_{44} = -80.1753320185758$$
$$x_{16} = -77.0363686410871$$
$$x_{52} = -73.8976273669175$$
$$x_{17} = -70.7591374966673$$
$$x_{18} = -67.6209337051216$$
$$x_{23} = -64.4830573281395$$
$$x_{47} = -61.3455580364299$$
$$x_{21} = -58.2084960384468$$
$$x_{10} = -55.0719450173938$$
$$x_{39} = -51.9359961028683$$
$$x_{48} = -48.8007633260567$$
$$x_{13} = -45.6663912429456$$
$$x_{26} = -42.5330657930663$$
$$x_{56} = -39.4010301009269$$
$$x_{53} = -36.2706080271563$$
$$x_{37} = -33.1422402299566$$
$$x_{35} = -30.0165410942153$$
$$x_{46} = -26.8943917751677$$
$$x_{55} = -23.7770983831808$$
$$x_{29} = -20.6666731902081$$
$$x_{1} = -17.5663599498268$$
$$x_{28} = -14.4816677478834$$
$$x_{19} = -11.4224997329587$$
$$x_{61} = -8.40755575235436$$
$$x_{57} = -5.47194116424952$$
$$x_{40} = 2.66733838749595$$
$$x_{8} = 5.47194116424952$$
$$x_{58} = 8.40755575235436$$
$$x_{49} = 11.4224997329587$$
$$x_{32} = 14.4816677478834$$
$$x_{5} = 17.5663599498268$$
$$x_{9} = 20.6666731902081$$
$$x_{63} = 23.7770983831808$$
$$x_{33} = 26.8943917751677$$
$$x_{25} = 30.0165410942153$$
$$x_{6} = 33.1422402299566$$
$$x_{24} = 36.2706080271563$$
$$x_{50} = 39.4010301009269$$
$$x_{12} = 42.5330657930663$$
$$x_{41} = 45.6663912429456$$
$$x_{36} = 48.8007633260567$$
$$x_{7} = 51.9359961028683$$
$$x_{22} = 55.0719450173938$$
$$x_{2} = 58.2084960384468$$
$$x_{11} = 61.3455580364299$$
$$x_{54} = 64.4830573281395$$
$$x_{34} = 67.6209337051216$$
$$x_{51} = 70.7591374966673$$
$$x_{31} = 73.8976273669175$$
$$x_{59} = 77.0363686410871$$
$$x_{62} = 80.1753320185758$$
$$x_{42} = 83.3144925727197$$
$$x_{45} = 86.4538289655055$$
$$x_{14} = 89.5933228253095$$
$$x_{30} = 92.7329582495637$$
$$x_{43} = 95.8727214040797$$
$$x_{38} = 99.0126001978345$$
son puntos de cambio del signo de desigualdad en las soluciones.
Primero definámonos con el signo hasta el punto extremo izquierdo:
$$x_{0} \leq x_{27}$$
Consideremos, por ejemplo, el punto
$$x_{0} = x_{27} - \frac{1}{10}$$
=
$$-99.0126001978345 + - \frac{1}{10}$$
=
$$-99.1126001978345$$
lo sustituimos en la expresión
$$\frac{x \cot{\left(x \right)}}{3} \leq - \sqrt{3}$$
$$\frac{\left(-99.1126001978345\right) \cot{\left(-99.1126001978345 \right)}}{3} \leq - \sqrt{3}$$
                        ___
-5.07533455988926 <= -\/ 3 
                     

significa que una de las soluciones de nuestra ecuación será con:
$$x \leq -99.0126001978345$$
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       x27      x3      x60      x15      x4      x20      x44      x16      x52      x17      x18      x23      x47      x21      x10      x39      x48      x13      x26      x56      x53      x37      x35      x46      x55      x29      x1      x28      x19      x61      x57      x40      x8      x58      x49      x32      x5      x9      x63      x33      x25      x6      x24      x50      x12      x41      x36      x7      x22      x2      x11      x54      x34      x51      x31      x59      x62      x42      x45      x14      x30      x43      x38

Recibiremos otras soluciones de la desigualdad pasando al polo siguiente etc.
etc.
Respuesta:
$$x \leq -99.0126001978345$$
$$x \geq -95.8727214040797 \wedge x \leq -92.7329582495637$$
$$x \geq -89.5933228253095 \wedge x \leq -86.4538289655055$$
$$x \geq -83.3144925727197 \wedge x \leq -80.1753320185758$$
$$x \geq -77.0363686410871 \wedge x \leq -73.8976273669175$$
$$x \geq -70.7591374966673 \wedge x \leq -67.6209337051216$$
$$x \geq -64.4830573281395 \wedge x \leq -61.3455580364299$$
$$x \geq -58.2084960384468 \wedge x \leq -55.0719450173938$$
$$x \geq -51.9359961028683 \wedge x \leq -48.8007633260567$$
$$x \geq -45.6663912429456 \wedge x \leq -42.5330657930663$$
$$x \geq -39.4010301009269 \wedge x \leq -36.2706080271563$$
$$x \geq -33.1422402299566 \wedge x \leq -30.0165410942153$$
$$x \geq -26.8943917751677 \wedge x \leq -23.7770983831808$$
$$x \geq -20.6666731902081 \wedge x \leq -17.5663599498268$$
$$x \geq -14.4816677478834 \wedge x \leq -11.4224997329587$$
$$x \geq -8.40755575235436 \wedge x \leq -5.47194116424952$$
$$x \geq 2.66733838749595 \wedge x \leq 5.47194116424952$$
$$x \geq 8.40755575235436 \wedge x \leq 11.4224997329587$$
$$x \geq 14.4816677478834 \wedge x \leq 17.5663599498268$$
$$x \geq 20.6666731902081 \wedge x \leq 23.7770983831808$$
$$x \geq 26.8943917751677 \wedge x \leq 30.0165410942153$$
$$x \geq 33.1422402299566 \wedge x \leq 36.2706080271563$$
$$x \geq 39.4010301009269 \wedge x \leq 42.5330657930663$$
$$x \geq 45.6663912429456 \wedge x \leq 48.8007633260567$$
$$x \geq 51.9359961028683 \wedge x \leq 55.0719450173938$$
$$x \geq 58.2084960384468 \wedge x \leq 61.3455580364299$$
$$x \geq 64.4830573281395 \wedge x \leq 67.6209337051216$$
$$x \geq 70.7591374966673 \wedge x \leq 73.8976273669175$$
$$x \geq 77.0363686410871 \wedge x \leq 80.1753320185758$$
$$x \geq 83.3144925727197 \wedge x \leq 86.4538289655055$$
$$x \geq 89.5933228253095 \wedge x \leq 92.7329582495637$$
$$x \geq 95.8727214040797 \wedge x \leq 99.0126001978345$$