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begin mathsize 14px style integral open parentheses 2 x squared sin invisible function application 2 x close parentheses d x equals end style...

  1. begin mathsize 14px style open parentheses negative x squared plus 1 half close parentheses sin invisible function application 2 x plus x cos invisible function application 2 x plus C end style

  2. begin mathsize 14px style open parentheses x squared minus 1 half close parentheses sin invisible function application 2 x minus x cos invisible function application 2 x plus C end style

  3. begin mathsize 14px style open parentheses negative x squared plus 1 half close parentheses cos invisible function application 2 x minus x sin invisible function application 2 x plus C end style

  4. begin mathsize 14px style open parentheses x squared minus 1 half close parentheses cos invisible function application 2 x minus x sin invisible function application 2 x plus C end style

  5. begin mathsize 14px style open parentheses negative x squared plus 1 half close parentheses cos invisible function application 2 x plus x sin invisible function application 2 x plus C end style

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N. Rahayu

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

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Pembahasan

Kita cari hasil integral di atas dengan menggunakan integral parsial. Misalkan dan , maka dan Sehingga Selanjutnya, kita gunakan integral parsial kembali untuk mencari hasil ∫x cos⁡2x dx. Misalkan p = x dan , maka dan Sehingga,

Kita cari hasil integral di atas dengan menggunakan integral parsial.

Misalkan begin mathsize 14px style u equals 2 x squared end style dan begin mathsize 14px style fraction numerator d v over denominator d x end fraction equals sin invisible function application 2 x end style, maka

begin mathsize 14px style fraction numerator d u over denominator d x end fraction equals 4 x end style

dan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row v equals cell integral fraction numerator d v over denominator d x end fraction d x end cell row blank equals cell integral sin invisible function application 2 x d x end cell row blank equals cell negative 1 half cos invisible function application 2 x plus C end cell end table end style 

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell integral open parentheses 2 x squared sin invisible function application 2 x close parentheses d x end cell equals cell 2 x squared times open parentheses negative 1 half cos invisible function application 2 x close parentheses minus integral open parentheses 4 x close parentheses open parentheses negative 1 half cos invisible function application 2 x close parentheses d x end cell row blank equals cell negative x squared cos invisible function application 2 x plus 2 integral x cos invisible function application 2 x d x end cell end table end style

Selanjutnya, kita gunakan integral parsial kembali untuk mencari hasil ∫x  cos⁡2x dx.

Misalkan p = x dan begin mathsize 14px style fraction numerator d q over denominator d x end fraction equals cos invisible function application 2 x end style, maka

undefined 

dan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row q equals cell integral fraction numerator d q over denominator d x end fraction d x end cell row blank equals cell integral cos invisible function application 2 x d x end cell row blank equals cell 1 half sin invisible function application 2 x plus C end cell end table end style 

Sehingga,

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell integral open parentheses 2 x squared sin invisible function application 2 x close parentheses d x end cell equals cell negative x squared cos invisible function application 2 x plus 2 integral x cos invisible function application 2 x d x end cell row blank equals cell negative x squared cos invisible function application 2 x plus 2 open square brackets x times open parentheses 1 half sin invisible function application 2 x close parentheses minus integral 1 half sin invisible function application 2 x d x close square brackets end cell row blank equals cell negative x squared cos invisible function application 2 x plus 2 open square brackets 1 half x sin invisible function application 2 x plus 1 fourth cos invisible function application 2 x close square brackets plus C end cell row blank equals cell negative x squared cos invisible function application 2 x plus x sin invisible function application 2 x plus 1 half cos invisible function application 2 x plus C end cell row blank equals cell open parentheses negative x squared plus 1 half close parentheses cos invisible function application 2 x plus x sin invisible function application 2 x plus C end cell end table end style   

 

 

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