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Tentukan semua nilai θ , 0 < θ < 2 π yang memenuhi masing-masing persamaan: c. 5 secan 2 θ − 23 secan θ − 10 = 0

Tentukan semua nilai ,  yang memenuhi masing-masing persamaan:

c.    

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himpunan penyelesaian dari persamaan trigonometri tersebut adalah .

himpunan penyelesaian dari persamaan trigonometri tersebut adalah open curly brackets 78 comma 46 degree space semicolon space 281 comma 54 degree close curly brackets.

Pembahasan

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 cos space x end cell equals cell cos space alpha end cell row x equals cell alpha plus k.360 degree end cell row blank blank atau row x equals cell negative alpha plus k.360 degree end cell end table

Maka:

table attributes columnalign right center left columnspacing 0px end attributes row cell 5 space secan squared theta minus 23 space secan space theta minus 10 end cell equals 0 row cell left parenthesis secan space theta minus 5 right parenthesis left parenthesis 5 space secan space theta plus 2 right parenthesis end cell equals 0 end table  

table attributes columnalign right center left columnspacing 0px end attributes row blank blank secan 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 5 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 secan 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 minus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 2 over 5 end cell end table 

  • table attributes columnalign right center left columnspacing 0px end attributes row blank blank secan 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 5 end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell secan space theta end cell equals 5 row cell cos space theta end cell equals cell 1 fifth end cell row cell cos space theta end cell equals cell cos space 78 comma 46 degree end cell row theta equals cell 78 comma 46 degree plus k.360 degree end cell row blank blank blank row k equals 0 row theta equals cell 78 comma 46 degree plus 0.360 degree end cell row blank equals cell 78 comma 46 degree end cell row blank blank blank row theta equals cell negative 78 comma 46 degree plus k.360 degree end cell row blank blank blank row k equals 1 row blank rightwards double arrow cell theta equals negative 78 comma 46 degree plus 1.360 degree end cell row blank equals cell 281 comma 54 degree end cell end table 

  • table attributes columnalign right center left columnspacing 0px end attributes row blank blank secan 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 minus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 2 over 5 end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell secan space theta end cell equals cell negative 2 over 5 end cell row cell cos space theta end cell equals cell negative 5 over 2 end cell end table 

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

Jadi, himpunan penyelesaian dari persamaan trigonometri tersebut adalah open curly brackets 78 comma 46 degree space semicolon space 281 comma 54 degree close curly brackets.

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