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Diketahui f ( x ) = sin ( x + 3 π ​ ) cos 3 2 x . Jika f' turunan pertama f, nilai f ( 3 π ​ ) adalah ...

Diketahui . Jika f' turunan pertama f, nilai  adalah ...

  1. table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell negative 5 over 2 end cell end table

  2. table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell negative 5 over 4 end cell end table

  3. table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell negative 1 end cell end table 

  4. table attributes columnalign right center left columnspacing 0px end attributes row blank blank 1 end table

  5. table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 5 over 4 end cell end table 

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N. Sari

Master Teacher

Mahasiswa/Alumni Universitas Nasional

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah C.

jawaban yang benar adalah C.

Pembahasan

Ingat aturan perkalian turunan fungsi trigonometri : Diketahui : Misalkan , maka . Misalkan , maka . Sehingga turunan pertamanya : Maka, . Oleh karena itu, jawaban yang benar adalah C.

Ingat aturan perkalian turunan fungsi trigonometri :

table attributes columnalign right center left columnspacing 0px end attributes row cell f apostrophe left parenthesis x right parenthesis end cell equals cell open parentheses u apostrophe v plus v apostrophe u close parentheses end cell end table   

Diketahui f left parenthesis x right parenthesis equals sin space open parentheses x plus straight pi over 3 close parentheses space cos cubed space 2 x :

Misalkan u equals sin space open parentheses x plus straight pi over 3 close parentheses, maka u apostrophe equals cos space open parentheses x plus straight pi over 3 close parentheses.

Misalkan v equals cos cubed space 2 x, maka v apostrophe equals negative 6 space cos squared space 2 x times sin space 2 x.

Sehingga turunan pertamanya :

table attributes columnalign right center left columnspacing 0px end attributes row cell f apostrophe left parenthesis x right parenthesis end cell equals cell u apostrophe v plus v apostrophe u end cell row blank equals cell cos space open parentheses x plus straight pi over 3 close parentheses times cos cubed space 2 x end cell row blank blank cell negative 6 space cos squared space 2 x times sin space 2 x times sin space open parentheses x plus straight pi over 3 close parentheses end cell row cell f open parentheses straight pi over 3 close parentheses end cell equals cell cos space open parentheses straight pi over 3 plus straight pi over 3 close parentheses times cos cubed space 2 open parentheses straight pi over 3 close parentheses end cell row blank blank cell negative 6 space cos squared space 2 open parentheses straight pi over 3 close parentheses times sin space 2 open parentheses straight pi over 3 close parentheses times sin space open parentheses straight pi over 3 plus straight pi over 3 close parentheses end cell row blank equals cell cos space open parentheses fraction numerator 2 straight pi over denominator 3 end fraction close parentheses times cos cubed space open parentheses fraction numerator 2 straight pi over denominator 3 end fraction close parentheses end cell row blank blank cell negative 6 space cos squared space open parentheses fraction numerator 2 straight pi over denominator 3 end fraction close parentheses times sin space open parentheses fraction numerator 2 straight pi over denominator 3 end fraction close parentheses times sin space open parentheses fraction numerator 2 straight pi over denominator 3 end fraction close parentheses end cell row blank equals cell cos to the power of 4 space open parentheses fraction numerator 2 straight pi over denominator 3 end fraction close parentheses minus 6 space cos squared space open parentheses fraction numerator 2 straight pi over denominator 3 end fraction close parentheses times sin squared space open parentheses fraction numerator 2 straight pi over denominator 3 end fraction close parentheses end cell row blank equals cell open parentheses 1 half close parentheses to the power of 4 minus 6 cross times open parentheses 1 half close parentheses squared cross times open parentheses fraction numerator square root of 3 over denominator 2 end fraction close parentheses squared end cell row blank equals cell 1 over 8 minus 6 cross times 1 fourth cross times 3 over 4 end cell row blank equals cell 1 over 8 minus 9 over 8 end cell row blank equals cell negative 8 over 8 end cell row blank equals cell negative 1 end cell end table      

Maka, f apostrophe open parentheses straight pi over 3 close parentheses equals negative 1.

Oleh karena itu, jawaban yang benar adalah C.

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