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Pertanyaan

Jika dalam segitiga ABC diketahui 3 sin⁡A + 4 cos⁡B = 1 dan 3 cos⁡A + 4 sin⁡B = 6, maka sin⁡C = ....

Jika dalam segitiga ABC diketahui 3 sin⁡A + 4 cos⁡B = 1 dan 3 cos⁡A + 4 sin⁡B = 6, maka sin⁡C = ....

  1. begin mathsize 14px style 1 half end style 

  2. begin mathsize 14px style 1 half square root of 2 end style 

  3. begin mathsize 14px style 1 half square root of 3 end style 

  4. begin mathsize 14px style square root of 3 end style 

  5. undefined 

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R. Rohmat

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah A.

jawaban yang tepat adalah A.

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Pembahasan

Perhatikan bahwa : dan Sehingga Ingat bahwa jumlah sudut dalam pada segitiga adalah 180°. Sehingga Maka Jadi, jawaban yang tepat adalah A.

Perhatikan bahwa :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 3 sin invisible function application straight A plus 4 cos invisible function application straight B end cell equals 1 row cell open parentheses 3 sin invisible function application straight A plus 4 cos invisible function application straight B close parentheses squared end cell equals cell 1 squared end cell row cell 9 sin squared invisible function application straight A plus 24 sin invisible function application Acos invisible function application straight B plus 16 cos squared invisible function application straight B end cell equals 1 end table end style 


dan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 3 cos invisible function application straight A plus 4 sin invisible function application straight B end cell equals 6 row cell open parentheses 3 cos invisible function application straight A plus 4 sin invisible function application straight B close parentheses squared end cell equals cell 6 squared end cell row cell 9 cos squared invisible function application straight A plus 24 cos invisible function application Asin invisible function application straight B plus 16 sin squared invisible function application straight B end cell equals 36 end table end style 


Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses 9 sin squared invisible function application straight A plus 24 sin invisible function application Acos invisible function application straight B plus 16 cos squared invisible function application straight B close parentheses plus open parentheses 9 cos squared invisible function application straight A plus 24 cos invisible function application Asin invisible function application straight B plus 16 sin squared invisible function application straight B close parentheses end cell equals cell 1 plus 36 end cell row cell open parentheses 9 sin squared invisible function application straight A plus 9 cos squared invisible function application straight A close parentheses plus open parentheses 24 sin invisible function application Acos invisible function application straight B plus 24 cos invisible function application Asin invisible function application straight B close parentheses plus open parentheses 16 cos squared invisible function application straight B plus 16 sin squared invisible function application straight B close parentheses end cell equals 37 row cell 9 open parentheses sin squared invisible function application straight A plus cos squared invisible function application straight A close parentheses plus 24 open parentheses sin invisible function application Acos invisible function application straight B plus cos invisible function application Asin invisible function application straight B close parentheses plus 16 open parentheses cos squared invisible function application straight B plus sin squared invisible function application straight B close parentheses end cell equals 37 row cell 9 open parentheses 1 close parentheses plus 24 sin invisible function application open parentheses straight A plus straight B close parentheses plus 16 open parentheses 1 close parentheses end cell equals 37 row cell 9 plus 24 sin invisible function application open parentheses straight A plus straight B close parentheses plus 16 end cell equals 37 row cell 24 sin invisible function application open parentheses straight A plus straight B close parentheses plus 25 end cell equals 37 row cell 24 sin invisible function application open parentheses straight A plus straight B close parentheses end cell equals 12 row cell sin invisible function application open parentheses straight A plus straight B close parentheses end cell equals cell 1 half end cell end table end style 

Ingat bahwa jumlah sudut dalam pada segitiga adalah 180°. Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight A plus straight B plus straight C end cell equals cell 180 degree end cell row straight C equals cell 180 degree minus open parentheses straight A plus straight B close parentheses end cell end table end style 

Maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell sin invisible function application straight C end cell equals cell sin invisible function application open parentheses 180 degree minus open parentheses straight A plus straight B close parentheses close parentheses end cell row blank equals cell sin invisible function application open parentheses straight A plus straight B close parentheses end cell row blank equals cell 1 half end cell end table end style 

Jadi, jawaban yang tepat adalah A.

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