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Tentukan semua nilai θ , 0 < θ < 2 π yang memenuhi masing-masing persamaan: d. 8 cosec 2 θ − 14 cosec θ + 5 = 0

Tentukan semua nilai ,  yang memenuhi masing-masing persamaan:

d.   

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himpunan penyelesaian dari persamaan trigonometri tersebut adalah .

himpunan penyelesaian dari persamaan trigonometri tersebut adalah open curly brackets 53 comma 13 degree space semicolon space 126 comma 87 degree close curly brackets.

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Ingat! Maka: Tidak memenuhi karena . Jadi, himpunan penyelesaian dari persamaan trigonometri tersebut adalah .

Ingat!

table attributes columnalign right center left columnspacing 0px end attributes row cell sin space x end cell equals cell sin space alpha end cell row x equals cell alpha plus k.360 degree end cell row blank blank atau row x equals cell left parenthesis 180 minus alpha right parenthesis plus k.360 degree end cell end table 

Maka:

table attributes columnalign right center left columnspacing 0px end attributes row cell 8 space cosec squared theta minus 14 space cosec space theta plus 5 end cell equals 0 row cell left parenthesis 4 space cosec space theta minus 5 right parenthesis left parenthesis 2 space cosec space theta minus 1 right parenthesis end cell equals 0 end table 

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cosec end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank theta end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 5 over 4 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank atau end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cosec end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank theta end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 1 half end cell end table 

  • table attributes columnalign right center left columnspacing 0px end attributes row blank blank cosec end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank theta end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 5 over 4 end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell cosec space theta end cell equals cell 5 over 4 end cell row cell sin space theta end cell equals cell 4 over 5 end cell row cell sin space theta end cell equals cell sin space 53 comma 13 degree end cell row theta equals cell 53 comma 13 degree plus k.360 degree end cell row blank blank blank row k equals 0 row blank rightwards double arrow cell theta equals 53 comma 13 degree plus 0.360 degree end cell row blank equals cell 53 comma 13 degree end cell row blank blank blank row theta equals cell left parenthesis 180 degree minus 53 comma 13 degree right parenthesis plus k.360 degree end cell row blank equals cell 126 comma 87 degree plus k.360 degree end cell row blank blank blank row k equals 0 row theta equals cell 126 comma 87 degree plus 0.360 degree end cell row blank equals cell 126 comma 87 degree end cell end table 

  • table attributes columnalign right center left columnspacing 0px end attributes row cell cosec space theta end cell equals cell 1 half end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell cosec space theta end cell equals cell 1 half end cell row cell sin space theta end cell equals 2 end table

Tidak memenuhi karena negative 1 less or equal than sin space theta less or equal than 1.

Jadi, himpunan penyelesaian dari persamaan trigonometri tersebut adalah open curly brackets 53 comma 13 degree space semicolon space 126 comma 87 degree close curly brackets.

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