Pertanyaan

sin 105° + sin 15° = ....

D. Kamilia

Master Teacher

Mahasiswa/Alumni Universitas Negeri Malang

Jawaban terverifikasi

Pembahasan

Ingat bahwa Sehingga

Ingat bahwa

Sehingga

$begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell sin invisible function application 105 degree plus sin invisible function application 15 degree end cell equals cell 2 space sin invisible function application open parentheses fraction numerator 105 degree plus 15 degree over denominator 2 end fraction close parentheses space cos invisible function application open parentheses fraction numerator 105 degree minus 15 degree over denominator 2 end fraction close parentheses end cell row blank equals cell 2 space sin invisible function application open parentheses fraction numerator 120 degree over denominator 2 end fraction close parentheses space space cos invisible function application open parentheses fraction numerator 90 degree over denominator 2 end fraction close parentheses end cell row blank equals cell 2 space sin invisible function application 60 degree space cos invisible function application 45 degree end cell row blank equals cell 2 open parentheses 1 half space square root of 3 close parentheses open parentheses 1 half space square root of 2 close parentheses end cell row blank equals cell 1 half space square root of 6 end cell end table end style$