sederhanakan cos 27° cos 18°- sin27°sin18°
Matematika
sindirahmawati68
Pertanyaan
sederhanakan cos 27° cos 18°- sin27°sin18°
2 Jawaban
-
1. Jawaban yogihendrawan89
cos(27+18)=cos(45)
[tex] = \frac{1}{2} \sqrt{2} [/tex] -
2. Jawaban komangsurini
Cos27° Cos18° - Sin27° Sin18° = Cos(x +b) = cosx cosy - sinx siny, maka
= Cos(27° + 18°)
= Cos(45°)
= 1/2√2