Sr Examen

sin(y)<(-1)/sqrt(2) desigualdades

En la desigualdad la incógnita

Solución

Ha introducido [src]
          -1  
sin(y) < -----
           ___
         \/ 2 
$$\sin{\left(y \right)} < - \frac{1}{\sqrt{2}}$$
sin(y) < -1/sqrt(2)
Solución detallada
Se da la desigualdad:
$$\sin{\left(y \right)} < - \frac{1}{\sqrt{2}}$$
Para resolver esta desigualdad primero hay que resolver la ecuación correspondiente:
$$\sin{\left(y \right)} = - \frac{1}{\sqrt{2}}$$
Resolvemos:
$$x_{1} = 68.329640215578$$
$$x_{2} = 73.0420291959627$$
$$x_{3} = -65.1880475619882$$
$$x_{4} = -46.3384916404494$$
$$x_{5} = 62.0464549083984$$
$$x_{6} = -63.6172512351933$$
$$x_{7} = 98.174770424681$$
$$x_{8} = -90.3207887907066$$
$$x_{9} = -38.484510006475$$
$$x_{10} = -128.019900633784$$
$$x_{11} = 74.6128255227576$$
$$x_{12} = 66.7588438887831$$
$$x_{13} = -51.0508806208341$$
$$x_{14} = -96.6039740978861$$
$$x_{15} = -27.4889357189107$$
$$x_{16} = 5.49778714378214$$
$$x_{17} = -52.621676947629$$
$$x_{18} = 80.8960108299372$$
$$x_{19} = -0.785398163397448$$
$$x_{20} = 18.0641577581413$$
$$x_{21} = -40.0553063332699$$
$$x_{22} = 93.4623814442964$$
$$x_{23} = -13.3517687777566$$
$$x_{24} = 41.6261026600648$$
$$x_{25} = 22.776546738526$$
$$x_{26} = 3.92699081698724$$
$$x_{27} = -215482.625507887$$
$$x_{28} = 91.8915851175014$$
$$x_{29} = 55.7632696012188$$
$$x_{30} = -2.35619449019234$$
$$x_{31} = 16.4933614313464$$
$$x_{32} = -101.316363078271$$
$$x_{33} = -8.63937979737193$$
$$x_{34} = 10.2101761241668$$
$$x_{35} = 11.7809724509617$$
$$x_{36} = -57.3340659280137$$
$$x_{37} = 49.4800842940392$$
$$x_{38} = -830.165858711103$$
$$x_{39} = -77.7544181763474$$
$$x_{40} = -44.7676953136546$$
$$x_{41} = 54.1924732744239$$
$$x_{42} = -69.9004365423729$$
$$x_{43} = -58.9048622548086$$
$$x_{44} = -76.1836218495525$$
$$x_{45} = 652.665873783279$$
$$x_{46} = -2865.91789823729$$
$$x_{47} = -25.9181393921158$$
$$x_{48} = 36.9137136796801$$
$$x_{49} = -371.493331286993$$
$$x_{50} = 30.6305283725005$$
$$x_{51} = 85.6083998103219$$
$$x_{52} = -19.6349540849362$$
$$x_{53} = -14.9225651045515$$
$$x_{54} = 99.7455667514759$$
$$x_{55} = 35.3429173528852$$
$$x_{56} = -21.2057504117311$$
$$x_{57} = -84.037603483527$$
$$x_{58} = 29.0597320457056$$
$$x_{59} = 87.1791961371168$$
$$x_{60} = -71.4712328691678$$
$$x_{61} = -82.4668071567321$$
$$x_{62} = -704.502152567511$$
$$x_{63} = 60.4756585816035$$
$$x_{64} = -88.7499924639117$$
$$x_{65} = -32.2013246992954$$
$$x_{66} = 43.1968989868597$$
$$x_{67} = -95.0331777710912$$
$$x_{68} = 79.3252145031423$$
$$x_{69} = -33.7721210260903$$
$$x_{70} = 47.9092879672443$$
$$x_{71} = -7.06858347057703$$
$$x_{72} = 24.3473430653209$$
$$x_{1} = 68.329640215578$$
$$x_{2} = 73.0420291959627$$
$$x_{3} = -65.1880475619882$$
$$x_{4} = -46.3384916404494$$
$$x_{5} = 62.0464549083984$$
$$x_{6} = -63.6172512351933$$
$$x_{7} = 98.174770424681$$
$$x_{8} = -90.3207887907066$$
$$x_{9} = -38.484510006475$$
$$x_{10} = -128.019900633784$$
$$x_{11} = 74.6128255227576$$
$$x_{12} = 66.7588438887831$$
$$x_{13} = -51.0508806208341$$
$$x_{14} = -96.6039740978861$$
$$x_{15} = -27.4889357189107$$
$$x_{16} = 5.49778714378214$$
$$x_{17} = -52.621676947629$$
$$x_{18} = 80.8960108299372$$
$$x_{19} = -0.785398163397448$$
$$x_{20} = 18.0641577581413$$
$$x_{21} = -40.0553063332699$$
$$x_{22} = 93.4623814442964$$
$$x_{23} = -13.3517687777566$$
$$x_{24} = 41.6261026600648$$
$$x_{25} = 22.776546738526$$
$$x_{26} = 3.92699081698724$$
$$x_{27} = -215482.625507887$$
$$x_{28} = 91.8915851175014$$
$$x_{29} = 55.7632696012188$$
$$x_{30} = -2.35619449019234$$
$$x_{31} = 16.4933614313464$$
$$x_{32} = -101.316363078271$$
$$x_{33} = -8.63937979737193$$
$$x_{34} = 10.2101761241668$$
$$x_{35} = 11.7809724509617$$
$$x_{36} = -57.3340659280137$$
$$x_{37} = 49.4800842940392$$
$$x_{38} = -830.165858711103$$
$$x_{39} = -77.7544181763474$$
$$x_{40} = -44.7676953136546$$
$$x_{41} = 54.1924732744239$$
$$x_{42} = -69.9004365423729$$
$$x_{43} = -58.9048622548086$$
$$x_{44} = -76.1836218495525$$
$$x_{45} = 652.665873783279$$
$$x_{46} = -2865.91789823729$$
$$x_{47} = -25.9181393921158$$
$$x_{48} = 36.9137136796801$$
$$x_{49} = -371.493331286993$$
$$x_{50} = 30.6305283725005$$
$$x_{51} = 85.6083998103219$$
$$x_{52} = -19.6349540849362$$
$$x_{53} = -14.9225651045515$$
$$x_{54} = 99.7455667514759$$
$$x_{55} = 35.3429173528852$$
$$x_{56} = -21.2057504117311$$
$$x_{57} = -84.037603483527$$
$$x_{58} = 29.0597320457056$$
$$x_{59} = 87.1791961371168$$
$$x_{60} = -71.4712328691678$$
$$x_{61} = -82.4668071567321$$
$$x_{62} = -704.502152567511$$
$$x_{63} = 60.4756585816035$$
$$x_{64} = -88.7499924639117$$
$$x_{65} = -32.2013246992954$$
$$x_{66} = 43.1968989868597$$
$$x_{67} = -95.0331777710912$$
$$x_{68} = 79.3252145031423$$
$$x_{69} = -33.7721210260903$$
$$x_{70} = 47.9092879672443$$
$$x_{71} = -7.06858347057703$$
$$x_{72} = 24.3473430653209$$
Las raíces dadas
$$x_{27} = -215482.625507887$$
$$x_{46} = -2865.91789823729$$
$$x_{38} = -830.165858711103$$
$$x_{62} = -704.502152567511$$
$$x_{49} = -371.493331286993$$
$$x_{10} = -128.019900633784$$
$$x_{32} = -101.316363078271$$
$$x_{14} = -96.6039740978861$$
$$x_{67} = -95.0331777710912$$
$$x_{8} = -90.3207887907066$$
$$x_{64} = -88.7499924639117$$
$$x_{57} = -84.037603483527$$
$$x_{61} = -82.4668071567321$$
$$x_{39} = -77.7544181763474$$
$$x_{44} = -76.1836218495525$$
$$x_{60} = -71.4712328691678$$
$$x_{42} = -69.9004365423729$$
$$x_{3} = -65.1880475619882$$
$$x_{6} = -63.6172512351933$$
$$x_{43} = -58.9048622548086$$
$$x_{36} = -57.3340659280137$$
$$x_{17} = -52.621676947629$$
$$x_{13} = -51.0508806208341$$
$$x_{4} = -46.3384916404494$$
$$x_{40} = -44.7676953136546$$
$$x_{21} = -40.0553063332699$$
$$x_{9} = -38.484510006475$$
$$x_{69} = -33.7721210260903$$
$$x_{65} = -32.2013246992954$$
$$x_{15} = -27.4889357189107$$
$$x_{47} = -25.9181393921158$$
$$x_{56} = -21.2057504117311$$
$$x_{52} = -19.6349540849362$$
$$x_{53} = -14.9225651045515$$
$$x_{23} = -13.3517687777566$$
$$x_{33} = -8.63937979737193$$
$$x_{71} = -7.06858347057703$$
$$x_{30} = -2.35619449019234$$
$$x_{19} = -0.785398163397448$$
$$x_{26} = 3.92699081698724$$
$$x_{16} = 5.49778714378214$$
$$x_{34} = 10.2101761241668$$
$$x_{35} = 11.7809724509617$$
$$x_{31} = 16.4933614313464$$
$$x_{20} = 18.0641577581413$$
$$x_{25} = 22.776546738526$$
$$x_{72} = 24.3473430653209$$
$$x_{58} = 29.0597320457056$$
$$x_{50} = 30.6305283725005$$
$$x_{55} = 35.3429173528852$$
$$x_{48} = 36.9137136796801$$
$$x_{24} = 41.6261026600648$$
$$x_{66} = 43.1968989868597$$
$$x_{70} = 47.9092879672443$$
$$x_{37} = 49.4800842940392$$
$$x_{41} = 54.1924732744239$$
$$x_{29} = 55.7632696012188$$
$$x_{63} = 60.4756585816035$$
$$x_{5} = 62.0464549083984$$
$$x_{12} = 66.7588438887831$$
$$x_{1} = 68.329640215578$$
$$x_{2} = 73.0420291959627$$
$$x_{11} = 74.6128255227576$$
$$x_{68} = 79.3252145031423$$
$$x_{18} = 80.8960108299372$$
$$x_{51} = 85.6083998103219$$
$$x_{59} = 87.1791961371168$$
$$x_{28} = 91.8915851175014$$
$$x_{22} = 93.4623814442964$$
$$x_{7} = 98.174770424681$$
$$x_{54} = 99.7455667514759$$
$$x_{45} = 652.665873783279$$
son puntos de cambio del signo de desigualdad en las soluciones.
Primero definámonos con el signo hasta el punto extremo izquierdo:
$$x_{0} < x_{27}$$
Consideremos, por ejemplo, el punto
$$x_{0} = x_{27} - \frac{1}{10}$$
=
$$-215482.625507887 + - \frac{1}{10}$$
=
$$-215482.725507887$$
lo sustituimos en la expresión
$$\sin{\left(y \right)} < - \frac{1}{\sqrt{2}}$$
$$\sin{\left(y \right)} < - \frac{1}{\sqrt{2}}$$
            ___ 
         -\/ 2  
sin(y) < -------
            2   
         

Entonces
$$x < -215482.625507887$$
no se cumple
significa que una de las soluciones de nuestra ecuación será con:
$$x > -215482.625507887 \wedge x < -2865.91789823729$$
         _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____  
        /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \  
-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------
       x27      x46      x38      x62      x49      x10      x32      x14      x67      x8      x64      x57      x61      x39      x44      x60      x42      x3      x6      x43      x36      x17      x13      x4      x40      x21      x9      x69      x65      x15      x47      x56      x52      x53      x23      x33      x71      x30      x19      x26      x16      x34      x35      x31      x20      x25      x72      x58      x50      x55      x48      x24      x66      x70      x37      x41      x29      x63      x5      x12      x1      x2      x11      x68      x18      x51      x59      x28      x22      x7      x54      x45

Recibiremos otras soluciones de la desigualdad pasando al polo siguiente etc.
etc.
Respuesta:
$$x > -215482.625507887 \wedge x < -2865.91789823729$$
$$x > -830.165858711103 \wedge x < -704.502152567511$$
$$x > -371.493331286993 \wedge x < -128.019900633784$$
$$x > -101.316363078271 \wedge x < -96.6039740978861$$
$$x > -95.0331777710912 \wedge x < -90.3207887907066$$
$$x > -88.7499924639117 \wedge x < -84.037603483527$$
$$x > -82.4668071567321 \wedge x < -77.7544181763474$$
$$x > -76.1836218495525 \wedge x < -71.4712328691678$$
$$x > -69.9004365423729 \wedge x < -65.1880475619882$$
$$x > -63.6172512351933 \wedge x < -58.9048622548086$$
$$x > -57.3340659280137 \wedge x < -52.621676947629$$
$$x > -51.0508806208341 \wedge x < -46.3384916404494$$
$$x > -44.7676953136546 \wedge x < -40.0553063332699$$
$$x > -38.484510006475 \wedge x < -33.7721210260903$$
$$x > -32.2013246992954 \wedge x < -27.4889357189107$$
$$x > -25.9181393921158 \wedge x < -21.2057504117311$$
$$x > -19.6349540849362 \wedge x < -14.9225651045515$$
$$x > -13.3517687777566 \wedge x < -8.63937979737193$$
$$x > -7.06858347057703 \wedge x < -2.35619449019234$$
$$x > -0.785398163397448 \wedge x < 3.92699081698724$$
$$x > 5.49778714378214 \wedge x < 10.2101761241668$$
$$x > 11.7809724509617 \wedge x < 16.4933614313464$$
$$x > 18.0641577581413 \wedge x < 22.776546738526$$
$$x > 24.3473430653209 \wedge x < 29.0597320457056$$
$$x > 30.6305283725005 \wedge x < 35.3429173528852$$
$$x > 36.9137136796801 \wedge x < 41.6261026600648$$
$$x > 43.1968989868597 \wedge x < 47.9092879672443$$
$$x > 49.4800842940392 \wedge x < 54.1924732744239$$
$$x > 55.7632696012188 \wedge x < 60.4756585816035$$
$$x > 62.0464549083984 \wedge x < 66.7588438887831$$
$$x > 68.329640215578 \wedge x < 73.0420291959627$$
$$x > 74.6128255227576 \wedge x < 79.3252145031423$$
$$x > 80.8960108299372 \wedge x < 85.6083998103219$$
$$x > 87.1791961371168 \wedge x < 91.8915851175014$$
$$x > 93.4623814442964 \wedge x < 98.174770424681$$
$$x > 99.7455667514759 \wedge x < 652.665873783279$$
Respuesta rápida [src]
   /5*pi          7*pi\
And|---- < x, x < ----|
   \ 4             4  /
$$\frac{5 \pi}{4} < x \wedge x < \frac{7 \pi}{4}$$
(5*pi/4 < x)∧(x < 7*pi/4)
Respuesta rápida 2 [src]
 5*pi  7*pi 
(----, ----)
  4     4   
$$x\ in\ \left(\frac{5 \pi}{4}, \frac{7 \pi}{4}\right)$$
x in Interval.open(5*pi/4, 7*pi/4)