Pertanyaan

sin 147° + sin 213° = ....

– cos 66°
– cos 33°
0
cos 33°
cos66°

D. Kamilia

Master Teacher

Mahasiswa/Alumni Universitas Negeri Malang

Jawaban terverifikasi

Pembahasan

Ingat bahwa : Sehingga

Ingat bahwa :

$begin mathsize 14px style sin invisible function application straight alpha plus sin invisible function application straight beta equals 2 space sin invisible function application open parentheses fraction numerator straight alpha plus straight beta over denominator 2 end fraction close parentheses space cos invisible function application open parentheses fraction numerator straight alpha minus straight beta over denominator 2 end fraction close parentheses end style$

Sehingga

$begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell sin invisible function application 147 degree plus sin invisible function application 213 degree end cell equals cell 2 space sin invisible function application open parentheses fraction numerator 147 degree plus 213 degree over denominator 2 end fraction close parentheses cos invisible function application open parentheses fraction numerator 147 degree minus 213 degree over denominator 2 end fraction close parentheses end cell row blank equals cell 2 space sin invisible function application open parentheses fraction numerator 360 degree over denominator 2 end fraction close parentheses cos invisible function application open parentheses fraction numerator negative 66 degree over denominator 2 end fraction close parentheses end cell row blank equals cell 2 space sin invisible function application 180 degree space space cos invisible function application left parenthesis negative 33 degree right parenthesis space end cell row blank equals cell 2 left parenthesis 0 right parenthesis space space cos invisible function application left parenthesis negative 33 degree right parenthesis space end cell row blank equals 0 end table end style$