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Pertanyaan

Tentukan f ( x ) jika diketahui fungsi-fungsi berikut f ( x ) = ( x 2 + 2 x ) cos ( x 2 + x + 6 )

Tentukan  jika diketahui fungsi-fungsi berikut

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F. Kurnia

Master Teacher

Mahasiswa/Alumni Universitas Jember

Jawaban terverifikasi

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Pembahasan

Diketahui . Ingat bahwa, turunan dari perkalian dua fungsi memenuhi persamaan berikut Misal , sehingga Dengan demikian, dari adalah

Diketahui f left parenthesis x right parenthesis equals left parenthesis x squared plus 2 x right parenthesis cos left parenthesis x squared plus x plus 6 right parenthesis.

Ingat bahwa, turunan dari perkalian dua fungsi memenuhi persamaan berikut

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

Misal 

table attributes columnalign right center left columnspacing 0px end attributes row cell x squared plus 2 x end cell equals cell u rightwards arrow u apostrophe equals 2 x plus 2 end cell row cell cos left parenthesis x squared plus x plus 6 right parenthesis end cell equals v row blank rightwards arrow cell negative left parenthesis 2 x plus 1 right parenthesis sin left parenthesis x squared plus x plus 6 right parenthesis equals v apostrophe end cell row blank blank blank row blank blank blank end table

, sehingga

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 u v apostrophe end cell row blank equals cell left parenthesis 2 x plus 2 right parenthesis cos left parenthesis x squared plus x plus 6 right parenthesis end cell row blank blank cell plus left parenthesis x squared plus 2 x right parenthesis left parenthesis negative left parenthesis 2 x plus 1 right parenthesis sin left parenthesis x squared plus x plus 6 right parenthesis right parenthesis end cell row blank equals cell left parenthesis 2 x plus 2 right parenthesis cos left parenthesis x squared plus x plus 6 right parenthesis minus left parenthesis 2 x cubed plus 5 x squared plus 2 x right parenthesis end cell row blank blank cell sin left parenthesis x squared plus x plus 6 right parenthesis end cell end table

Dengan demikian, f apostrophe left parenthesis x right parenthesis dari f left parenthesis x right parenthesis equals left parenthesis x squared plus 2 x right parenthesis cos left parenthesis x squared plus x plus 6 right parenthesis adalah

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell left parenthesis 2 x plus 2 right parenthesis cos left parenthesis x squared plus x plus 6 right parenthesis minus left parenthesis 2 x cubed plus 5 x squared plus 2 x right parenthesis end cell row blank blank cell sin left parenthesis x squared plus x plus 6 right parenthesis end cell end table

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