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Himpunan nilai x yang memenuhi persamaan sin ( 12 0 ∘ + 2 x ) = cos ( x + 6 0 ∘ ) untuk 0 ∘ ≤ x ≤ 36 0 ∘ adalah...

Himpunan nilai x   yang memenuhi persamaan  untuk  adalah...

  1. left curly bracket 60 degree comma space 300 degree right curly bracket 

  2. left curly bracket 30 degree comma space 120 degree comma space 300 degree right curly bracket 

  3. left curly bracket 60 degree comma space 150 degree comma space 330 degree right curly bracket 

  4. left curly bracket 30 degree comma space 330 degree right curly bracket

  5. left curly bracket 60 degree comma space 330 degree right curly bracket 

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S. Nur

Master Teacher

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Pembahasan

Ingat kembali rumus berikut! Jika diketahui , maka Dengan rumus di atas, diperoleh perhitungan sebagai berikut. atau Maka nilai adalah Jadi, yang memenuhi nilai x adalah . Jadi, tidak ada jawaban yang tepat.

Ingat kembali rumus berikut!

  • cos space x equals sin space left parenthesis 90 degree plus x right parenthesis 
  • Jika diketahui  sin space x equals sin space alpha, maka

x equals alpha plus k times 360 degree space atau space x equals left parenthesis 180 minus alpha right parenthesis degree plus k times 360 degree 

Dengan rumus di atas, diperoleh perhitungan sebagai berikut.

table attributes columnalign right center left columnspacing 0px end attributes row cell sin space left parenthesis 120 degree plus 2 x right parenthesis end cell equals cell cos space left parenthesis x plus 60 degree right parenthesis end cell row cell sin space left parenthesis 120 degree plus 2 x right parenthesis end cell equals cell sin space open parentheses 90 degree plus left parenthesis x plus 60 degree right parenthesis close parentheses end cell row cell sin space left parenthesis 120 degree plus 2 x right parenthesis end cell equals cell sin space open parentheses 90 degree plus x plus 60 degree close parentheses end cell row cell sin space left parenthesis 120 degree plus 2 x right parenthesis end cell equals cell sin space open parentheses 150 degree plus x close parentheses end cell end table 

begin mathsize 12px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses 120 degree plus 2 x close parentheses end cell equals cell open parentheses 150 degree plus x close parentheses plus k times 360 degree end cell row cell 2 x minus x end cell equals cell 150 degree minus 120 degree plus k times 360 degree end cell row x equals cell 30 degree plus k times 360 degree end cell end table end style 

atau 

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses 120 degree plus 2 x close parentheses end cell equals cell 180 degree minus open parentheses 150 degree plus x close parentheses plus k times 360 degree end cell row cell 120 degree plus 2 x end cell equals cell 30 degree minus x plus k times 360 degree end cell row cell 2 x plus x end cell equals cell 30 degree minus 120 plus k times 360 degree end cell row cell 3 x end cell equals cell negative 90 degree plus k times 360 degree end cell row x equals cell fraction numerator negative 90 degree plus k times 360 degree over denominator 3 end fraction end cell row x equals cell negative 30 degree plus k times 120 degree end cell end table

Maka nilai x adalah

table attributes columnalign right center left columnspacing 0px end attributes row x equals cell 30 degree plus 0 times 360 degree end cell row x equals cell 30 degree end cell end table   table attributes columnalign right center left columnspacing 0px end attributes row x equals cell negative 30 degree plus 0 times 120 degree end cell row x equals cell negative 30 degree space left parenthesis TM right parenthesis end cell end table 
 table attributes columnalign right center left columnspacing 0px end attributes row x equals cell 30 degree plus 1 times 360 degree end cell row x equals cell 30 degree plus 360 degree end cell row x equals cell 390 degree space left parenthesis TM right parenthesis end cell end table  table attributes columnalign right center left columnspacing 0px end attributes row x equals cell negative 30 degree plus 1 times 120 degree end cell row x equals cell negative 30 degree plus 120 degree end cell row x equals cell 90 degree end cell end table 
 table attributes columnalign right center left columnspacing 0px end attributes row x equals cell 30 degree plus 2 times 360 degree end cell row x equals cell 30 degree plus 720 degree end cell row x equals cell 750 degree space left parenthesis TM right parenthesis end cell end table table attributes columnalign right center left columnspacing 0px end attributes row x equals cell negative 30 degree plus 2 times 120 degree end cell row x equals cell negative 30 degree plus 240 degree end cell row x equals cell 210 degree end cell end table
table attributes columnalign right center left columnspacing 0px end attributes row x equals cell 30 degree plus 3 times 360 degree end cell row x equals cell 30 degree plus 1080 degree end cell row x equals cell 1110 degree space left parenthesis TM right parenthesis end cell end table table attributes columnalign right center left columnspacing 0px end attributes row x equals cell negative 30 degree plus 3 times 120 degree end cell row x equals cell negative 30 degree plus 360 degree end cell row x equals cell 330 degree end cell end table

Jadi, yang memenuhi nilai x adalah open curly brackets 30 degree comma space 90 degree comma space 210 degree comma space 330 degree close curly brackets.

Jadi, tidak ada jawaban yang tepat.

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Banyak x yang memenuhi persamaan sin 0 , 5 x = cos x pada interval 0 ∘ ≤ x ≤ 36 0 ∘ adalah ....

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