Se da la desigualdad:
(−7sin(x)+2sin(2x))+3>0Para resolver esta desigualdad primero hay que resolver la ecuación correspondiente:
(−7sin(x)+2sin(2x))+3=0Resolvemos:
x1=−87.1690749807234x2=−36.9035925232867x3=95.0432989274846x4=−66.2537559502919x5=25.9282605485092x6=−74.6027043663642x7=63.6273723915867x8=−49.4699631376459x9=−59.9705706431123x10=57.3441870844071x11=−28.5546441072143x12=−3.421902878496x13=13.36188993415x14=−99.7354455950826x15=−72.5369412574715x16=−30.6204072161071x17=38.4946311628683x18=−24.3372219089275x19=−9.70508818567559x20=65.6931355004795x21=−11.7708512945684x22=−80.8858896735438x23=88.760113620305x24=32.2114458556888x25=90.8258767291978x26=−41.1210147215735x27=−91.3864971790102x28=27.9940236574019x29=−18.0540366017479x30=−62.036333752005x31=34.2772089645815x32=84.5426914220182x33=78.2595061148386x34=−78.820126564651x35=−47.4042000287531x36=51.0610017772275x37=97.1090620363774x38=76.1937430059459x39=40.5603942717611x40=−43.1867778304663x41=−97.6696824861898x42=53.1267648861203x43=−93.452260287903x44=21.7108383502223x45=2.86128242868359x46=−68.3195190591846x47=−22.2714588000348x48=−15.9882734928552x49=9.14446773586317x50=44.7778164700479x51=14194.5111282385x52=69.9105576987663x53=101.326484234664x54=46.8435795789407x55=15.4276530430428x56=71.976320807659x57=7.07870462697041x58=0.795519319790823x59=−34.8378294143939x60=82.4769283131254x61=−53.6873853359327x62=−5.48766598738876x63=−55.7531484448255x64=59.4099501932999x65=19.6450752413296x1=−87.1690749807234x2=−36.9035925232867x3=95.0432989274846x4=−66.2537559502919x5=25.9282605485092x6=−74.6027043663642x7=63.6273723915867x8=−49.4699631376459x9=−59.9705706431123x10=57.3441870844071x11=−28.5546441072143x12=−3.421902878496x13=13.36188993415x14=−99.7354455950826x15=−72.5369412574715x16=−30.6204072161071x17=38.4946311628683x18=−24.3372219089275x19=−9.70508818567559x20=65.6931355004795x21=−11.7708512945684x22=−80.8858896735438x23=88.760113620305x24=32.2114458556888x25=90.8258767291978x26=−41.1210147215735x27=−91.3864971790102x28=27.9940236574019x29=−18.0540366017479x30=−62.036333752005x31=34.2772089645815x32=84.5426914220182x33=78.2595061148386x34=−78.820126564651x35=−47.4042000287531x36=51.0610017772275x37=97.1090620363774x38=76.1937430059459x39=40.5603942717611x40=−43.1867778304663x41=−97.6696824861898x42=53.1267648861203x43=−93.452260287903x44=21.7108383502223x45=2.86128242868359x46=−68.3195190591846x47=−22.2714588000348x48=−15.9882734928552x49=9.14446773586317x50=44.7778164700479x51=14194.5111282385x52=69.9105576987663x53=101.326484234664x54=46.8435795789407x55=15.4276530430428x56=71.976320807659x57=7.07870462697041x58=0.795519319790823x59=−34.8378294143939x60=82.4769283131254x61=−53.6873853359327x62=−5.48766598738876x63=−55.7531484448255x64=59.4099501932999x65=19.6450752413296Las raíces dadas
x14=−99.7354455950826x41=−97.6696824861898x43=−93.452260287903x27=−91.3864971790102x1=−87.1690749807234x22=−80.8858896735438x34=−78.820126564651x6=−74.6027043663642x15=−72.5369412574715x46=−68.3195190591846x4=−66.2537559502919x30=−62.036333752005x9=−59.9705706431123x63=−55.7531484448255x61=−53.6873853359327x8=−49.4699631376459x35=−47.4042000287531x40=−43.1867778304663x26=−41.1210147215735x2=−36.9035925232867x59=−34.8378294143939x16=−30.6204072161071x11=−28.5546441072143x18=−24.3372219089275x47=−22.2714588000348x29=−18.0540366017479x48=−15.9882734928552x21=−11.7708512945684x19=−9.70508818567559x62=−5.48766598738876x12=−3.421902878496x58=0.795519319790823x45=2.86128242868359x57=7.07870462697041x49=9.14446773586317x13=13.36188993415x55=15.4276530430428x65=19.6450752413296x44=21.7108383502223x5=25.9282605485092x28=27.9940236574019x24=32.2114458556888x31=34.2772089645815x17=38.4946311628683x39=40.5603942717611x50=44.7778164700479x54=46.8435795789407x36=51.0610017772275x42=53.1267648861203x10=57.3441870844071x64=59.4099501932999x7=63.6273723915867x20=65.6931355004795x52=69.9105576987663x56=71.976320807659x38=76.1937430059459x33=78.2595061148386x60=82.4769283131254x32=84.5426914220182x23=88.760113620305x25=90.8258767291978x3=95.0432989274846x37=97.1090620363774x53=101.326484234664x51=14194.5111282385son puntos de cambio del signo de desigualdad en las soluciones.
Primero definámonos con el signo hasta el punto extremo izquierdo:
x0<x14Consideremos, por ejemplo, el punto
x0=x14−101=
−99.7354455950826+−101=
−99.8354455950826lo sustituimos en la expresión
(−7sin(x)+2sin(2x))+3>0(−7sin(−99.8354455950826)+2sin((−99.8354455950826)2))+3>00.482284559587646 > 0
significa que una de las soluciones de nuestra ecuación será con:
x<−99.7354455950826 _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____
\ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \
-------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-------
x14 x41 x43 x27 x1 x22 x34 x6 x15 x46 x4 x30 x9 x63 x61 x8 x35 x40 x26 x2 x59 x16 x11 x18 x47 x29 x48 x21 x19 x62 x12 x58 x45 x57 x49 x13 x55 x65 x44 x5 x28 x24 x31 x17 x39 x50 x54 x36 x42 x10 x64 x7 x20 x52 x56 x38 x33 x60 x32 x23 x25 x3 x37 x53 x51
Recibiremos otras soluciones de la desigualdad pasando al polo siguiente etc.
etc.
Respuesta:
x<−99.7354455950826x>−97.6696824861898∧x<−93.452260287903x>−91.3864971790102∧x<−87.1690749807234x>−80.8858896735438∧x<−78.820126564651x>−74.6027043663642∧x<−72.5369412574715x>−68.3195190591846∧x<−66.2537559502919x>−62.036333752005∧x<−59.9705706431123x>−55.7531484448255∧x<−53.6873853359327x>−49.4699631376459∧x<−47.4042000287531x>−43.1867778304663∧x<−41.1210147215735x>−36.9035925232867∧x<−34.8378294143939x>−30.6204072161071∧x<−28.5546441072143x>−24.3372219089275∧x<−22.2714588000348x>−18.0540366017479∧x<−15.9882734928552x>−11.7708512945684∧x<−9.70508818567559x>−5.48766598738876∧x<−3.421902878496x>0.795519319790823∧x<2.86128242868359x>7.07870462697041∧x<9.14446773586317x>13.36188993415∧x<15.4276530430428x>19.6450752413296∧x<21.7108383502223x>25.9282605485092∧x<27.9940236574019x>32.2114458556888∧x<34.2772089645815x>38.4946311628683∧x<40.5603942717611x>44.7778164700479∧x<46.8435795789407x>51.0610017772275∧x<53.1267648861203x>57.3441870844071∧x<59.4099501932999x>63.6273723915867∧x<65.6931355004795x>69.9105576987663∧x<71.976320807659x>76.1937430059459∧x<78.2595061148386x>82.4769283131254∧x<84.5426914220182x>88.760113620305∧x<90.8258767291978x>95.0432989274846∧x<97.1090620363774x>101.326484234664∧x<14194.5111282385