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Pertanyaan

Jumlah nilai x yang memenuhi persamaan sin 4 x + sin 2 x = 0 pada interval 0 ≤ x ≤ π adalah …

Jumlah nilai  yang memenuhi persamaan  pada interval  adalah …

  1. begin mathsize 14px style 3 over 2 pi end style 

  2. begin mathsize 14px style 2 straight pi end style 

  3. begin mathsize 14px style 5 over 2 pi end style 

  4. begin mathsize 14px style 3 straight pi end style 

  5. begin mathsize 14px style 7 over 2 pi end style 

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I. Sutiawan

Master Teacher

Mahasiswa/Alumni Universitas Pasundan

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah C.

jawaban yang tepat adalah C.

Pembahasan

Ingat! Sehingga: Maka: Jadi, jawaban yang tepat adalah C.

Ingat!

table attributes columnalign right center left columnspacing 0px end attributes row cell sin space 2 alpha end cell equals cell 2 space sin space alpha space cos space alpha end cell row blank blank blank 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 cell atau space end cell row x equals cell left parenthesis straight pi minus alpha right parenthesis plus k.2 straight pi space end cell row blank blank blank row cell cos space x end cell equals cell cos space alpha end cell row x equals cell alpha plus k.2 straight pi end cell row blank blank cell atau space end cell row x equals cell negative alpha plus k.360 degree end cell end table   

Sehingga:

table attributes columnalign right center left columnspacing 0px end attributes row cell sin space 4 straight x plus sin space 2 straight x end cell equals 0 row cell 2 space sin space 2 straight x space cos space 2 straight x plus sin space 2 straight x end cell equals 0 row cell sin space 2 straight x blank open parentheses 2 space cos space 2 straight x plus 1 close parentheses end cell equals 0 end table  

table attributes columnalign right center left columnspacing 0px end attributes row blank blank sin 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 2 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank straight x 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 0 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 cos 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 2 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank straight x 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 1 half end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell sin space 2 straight x end cell equals 0 row cell sin space 2 straight x end cell equals cell sin space 0 end cell row blank blank blank row cell 2 straight x end cell equals cell 0 plus straight k.2 straight pi end cell row straight x equals cell 0 plus straight k. straight pi end cell row straight k equals cell 0 space space maka space space straight x equals 0 end cell row straight k equals cell 1 space space maka space space straight x equals straight pi end cell row blank blank blank row cell 2 straight x end cell equals cell open parentheses straight pi minus 0 close parentheses plus straight k.2 straight pi end cell row straight x equals cell straight pi over 2 plus straight k. straight pi end cell row straight k equals cell 0 space space maka space straight x equals straight pi over 2 end cell row blank blank blank row cell cos space 2 straight x end cell equals cell negative 1 half end cell row cell cos space 2 straight x end cell equals cell cos space fraction numerator 2 straight pi over denominator 3 end fraction end cell row blank blank blank row cell 2 straight x end cell equals cell fraction numerator 2 straight pi over denominator 3 end fraction plus straight k.2 straight pi end cell row straight x equals cell straight pi over 3 plus straight k. straight pi end cell row straight k equals cell 0 space space maka space straight x equals straight pi over 3 end cell row blank blank blank row cell 2 straight x end cell equals cell negative fraction numerator 2 straight pi over denominator 3 end fraction plus straight k.2 straight pi end cell row straight x equals cell negative straight pi over 3 plus straight k. straight pi end cell row straight k equals cell 1 space space maka space space straight x equals fraction numerator 2 straight pi over denominator 3 end fraction end cell end table 

Maka:

table attributes columnalign right center left columnspacing 0px end attributes row cell jumlah space nilai space x end cell equals cell 0 plus straight pi plus straight pi over 2 plus straight pi over 3 plus fraction numerator 2 straight pi over denominator 3 end fraction end cell row blank equals cell 5 over 2 straight pi end cell end table 

Jadi, jawaban yang tepat adalah C.

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