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Pertanyaan

Hasil dari ∫ sin 3 x cos 5 x d x = ....

Hasil dari ....

  1. begin mathsize 14px style 1 third sin cubed invisible function application x minus 1 fifth sin to the power of 5 invisible function application x plus 1 over 7 sin to the power of 7 blank invisible function application x plus C end style 

  2. begin mathsize 14px style 1 fourth sin to the power of 4 invisible function application x minus 1 third sin to the power of 6 invisible function application x plus 7 over 8 sin to the power of 8 blank invisible function application x plus C end style 

  3. begin mathsize 14px style 4 sin to the power of 4 invisible function application x plus 1 over 6 sin to the power of 6 invisible function application x minus 7 over 8 sin to the power of 8 blank invisible function application x plus C end style 

  4. begin mathsize 14px style 4 cos to the power of 4 invisible function application x minus 1 third cos to the power of 6 invisible function application x plus 7 over 8 cos to the power of 8 blank invisible function application x plus C end style 

  5. begin mathsize 14px style 1 fourth cos to the power of 4 invisible function application x plus 2 over 3 cos to the power of 6 invisible function application x minus 1 over 8 cos to the power of 8 blank invisible function application x plus C end style 

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N. Rahayu

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

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Pembahasan

Misalkan: u = sin ⁡x Maka, Sehingga, integral di atas menjadi, Jadi,

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell integral sin cubed invisible function application x cos to the power of 5 invisible function application x d x end cell equals cell integral open parentheses sin cubed invisible function application x cos to the power of 4 invisible function application x cos invisible function application x close parentheses d x end cell row blank equals cell integral sin cubed invisible function application x open parentheses 1 minus sin squared invisible function application x close parentheses squared cos invisible function application x d x end cell row blank equals cell integral open parentheses sin cubed invisible function application x open parentheses 1 minus 2 sin squared invisible function application x plus sin to the power of 4 invisible function application x close parentheses close parentheses cos invisible function application x d x end cell row blank equals cell integral open parentheses sin cubed invisible function application x minus 2 sin to the power of 5 invisible function application x plus sin to the power of 7 invisible function application x close parentheses cos invisible function application x d x end cell end table end style

Misalkan:
u = sin ⁡x

Maka,

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator d u over denominator d x end fraction end cell equals cell cos invisible function application x end cell row cell integral fraction numerator d u over denominator d x end fraction d x end cell equals cell integral cos invisible function application x d x end cell row cell integral d u end cell equals cell integral cos invisible function application x d x end cell end table end style

Sehingga, integral di atas menjadi,

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell integral open parentheses sin cubed invisible function application x minus 2 sin to the power of 5 invisible function application x plus sin to the power of 7 invisible function application x close parentheses cos invisible function application x d x end cell equals cell integral open parentheses u cubed minus 2 u to the power of 5 plus u to the power of 7 close parentheses d u end cell row blank equals cell 1 fourth u to the power of 4 minus 2 over 6 u to the power of 6 plus 7 over 8 u to the power of 8 plus C end cell row blank equals cell 1 fourth sin to the power of 4 invisible function application x minus 1 third sin to the power of 6 invisible function application x plus 7 over 8 sin to the power of 8 blank invisible function application x plus C end cell end table end style

Jadi,

begin mathsize 14px style integral sin cubed invisible function application x cos to the power of 5 invisible function application x d x equals 1 fourth sin to the power of 4 invisible function application x minus 1 third sin to the power of 6 invisible function application x plus 7 over 8 sin to the power of 8 blank invisible function application x plus C end style 

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