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Diketahui tiga buah fungsi f(x) = sin ⁡x + cos ⁡x, g(x) = sin ⁡x - cos ⁡x, dan h(x) = sin ⁡x. Misalkan V 1 ​ adalah volume benda putar yang dibentuk antara grafik fungsi f(x) dan h(x) pada interval 0 ≤ x ≤ 4 π ​ dan V 2 ​ adalah volume benda putar yang dibentuk antara grafik fungsi g(x) dan h(x) pada interval 4 π ​ ≤ x ≤ 2 π ​ . Maka V 2 ​ V 1 ​ ​ = .....

Diketahui tiga buah fungsi f(x) = sin ⁡x + cos ⁡x, g(x) = sin ⁡x - cos ⁡x, dan h(x) = sin ⁡x. Misalkan  adalah volume benda putar yang dibentuk antara grafik fungsi f(x) dan h(x) pada interval  dan  adalah volume benda putar yang dibentuk antara grafik fungsi g(x) dan h(x) pada interval . Maka .....

  1. begin mathsize 14px style fraction numerator pi plus 6 over denominator 6 minus pi end fraction end style 

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R. Bella

Master Teacher

Mahasiswa/Alumni UIN Syarif Hidayatullah Jakarta

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Pembahasan

adalah volume benda putar yang dibentuk antara grafik fungsi f(x) = sin⁡ x + cos ⁡x dan h(x) = sin ⁡x pada interval . Perhatikan bahwa interval terletak pada kuadran I, sehingga cos⁡ x > 0, maka f(x) > h(x), maka adalah volume benda putar yang dibentuk antara grafik fungsi g(x) = sin ⁡x - cos ⁡x dan h(x) = sin ⁡x pada interval . Perhatikan bahwa interval terletak pada kuadran I, sehingga cos⁡ x > 0, maka g(x) < h(x), maka Sehingga

begin mathsize 14px style V subscript 1 end style adalah volume benda putar yang dibentuk antara grafik fungsi f(x) = sin⁡ x + cos ⁡x dan h(x) = sin ⁡x pada interval begin mathsize 14px style 0 less or equal than x less or equal than pi over 4 end style.

Perhatikan bahwa interval begin mathsize 14px style 0 less or equal than x less or equal than pi over 4 end style terletak pada kuadran I, sehingga cos⁡ x > 0, maka f(x) > h(x), maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell V subscript 1 end cell equals cell pi integral from x subscript k i r i end subscript to x subscript k a n a n end subscript of y subscript a t a s end subscript superscript 2 minus y subscript b a w a h end subscript superscript 2 d x end cell row cell V subscript 1 end cell equals cell pi integral from 0 to pi over 4 of open parentheses sin invisible function application x plus cos invisible function application x close parentheses squared minus open parentheses sin invisible function application x close parentheses squared d x end cell row cell V subscript 1 end cell equals cell pi integral from 0 to pi over 4 of sin squared invisible function application x plus 2 sin invisible function application x cos invisible function application x plus cos squared invisible function application x minus sin squared invisible function application x d x end cell row cell V subscript 1 end cell equals cell pi integral from 0 to pi over 4 of 2 sin invisible function application x cos invisible function application x plus cos squared invisible function application x d x end cell row cell V subscript 1 end cell equals cell pi integral from 0 to pi over 4 of sin invisible function application 2 x plus open parentheses 1 half plus 1 half cos invisible function application 2 x close parentheses d x end cell row cell V subscript 1 end cell equals cell open pi open parentheses negative 1 half cos invisible function application 2 x plus 1 half x plus 1 fourth sin invisible function application 2 x close parentheses close square brackets subscript 0 superscript pi over 4 end superscript end cell row cell V subscript 1 end cell equals cell pi open parentheses open parentheses negative 1 half cos invisible function application 2 open parentheses pi over 4 close parentheses plus 1 half open parentheses pi over 4 close parentheses plus 1 fourth sin invisible function application 2 open parentheses pi over 4 close parentheses close parentheses minus open parentheses negative 1 half cos invisible function application 2 open parentheses 0 close parentheses plus 1 half open parentheses 0 close parentheses plus 1 fourth sin invisible function application 2 open parentheses 0 close parentheses close parentheses close parentheses end cell row cell V subscript 1 end cell equals cell pi open parentheses open parentheses 0 plus pi over 8 plus 1 fourth close parentheses minus open parentheses negative 1 half plus 0 plus 0 close parentheses close parentheses end cell row cell V subscript 1 end cell equals cell pi open parentheses pi over 8 plus 3 over 4 close parentheses end cell end table end style 

begin mathsize 14px style V subscript 2 end style adalah volume benda putar yang dibentuk antara grafik fungsi g(x) = sin ⁡x - cos ⁡x dan h(x) = sin ⁡x pada interval begin mathsize 14px style pi over 4 less or equal than x less or equal than pi over 2 end style.

Perhatikan bahwa interval begin mathsize 14px style pi over 4 less or equal than x less or equal than pi over 2 end style terletak pada kuadran I, sehingga cos⁡ x > 0, maka g(x) < h(x), maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell V subscript 2 end cell equals cell pi integral from x subscript k i r i end subscript to x subscript k a n a n end subscript of y subscript a t a s end subscript superscript 2 minus y subscript b a w a h end subscript superscript 2 d x end cell row cell V subscript 2 end cell equals cell pi integral from pi over 4 to pi over 2 of open parentheses sin invisible function application x close parentheses squared minus open parentheses sin invisible function application x minus cos invisible function application x close parentheses squared d x end cell row cell V subscript 2 end cell equals cell pi integral from pi over 4 to pi over 2 of sin squared invisible function application x minus open parentheses sin squared invisible function application x minus 2 sin invisible function application x cos invisible function application x plus cos squared invisible function application x close parentheses d x end cell row cell V subscript 2 end cell equals cell pi integral from pi over 4 to pi over 2 of 2 sin invisible function application x cos invisible function application x minus cos squared invisible function application x d x end cell row cell V subscript 2 end cell equals cell pi integral from pi over 4 to pi over 2 of sin invisible function application 2 x minus open parentheses 1 half plus 1 half cos invisible function application 2 x close parentheses d x end cell row cell V subscript 2 end cell equals cell pi open open parentheses negative 1 half cos invisible function application 2 x minus 1 half x minus 1 fourth sin invisible function application 2 x close parentheses close square brackets subscript pi over 4 end subscript superscript pi over 2 end superscript end cell row cell V subscript 2 end cell equals cell pi open parentheses open parentheses negative 1 half cos invisible function application 2 open parentheses pi over 2 close parentheses minus 1 half open parentheses pi over 2 close parentheses minus 1 fourth sin invisible function application 2 open parentheses pi over 2 close parentheses close parentheses minus open parentheses negative 1 half cos invisible function application 2 open parentheses pi over 4 close parentheses minus 1 half open parentheses pi over 4 close parentheses minus 1 fourth sin invisible function application 2 open parentheses pi over 4 close parentheses close parentheses close parentheses end cell row cell V subscript 2 end cell equals cell pi open parentheses open parentheses 1 half minus pi over 4 minus 0 close parentheses minus open parentheses 0 minus pi over 8 minus 1 fourth close parentheses close parentheses end cell row cell V subscript 2 end cell equals cell pi open parentheses 3 over 4 minus pi over 8 close parentheses end cell end table end style

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell V subscript 1 over V subscript 2 end cell equals cell fraction numerator pi open parentheses pi over 8 plus 3 over 4 close parentheses over denominator pi open parentheses 3 over 4 minus pi over 8 close parentheses end fraction end cell row blank equals cell fraction numerator pi over 8 plus 3 over 4 over denominator 3 over 4 minus pi over 8 end fraction times 8 over 8 end cell row blank equals cell fraction numerator pi plus 6 over denominator 6 minus pi end fraction end cell end table end style 

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