Question

Buktikan bahwa sin 60 = 2 sin 30 cos 30

Answer 1

Sin60=2.sin30.cos30
1/2√3=2.1/2.1/2√3
1/2√3=(2*1/2)1/2√3
1/2√3=1.1/2√3
1/2√3=1/2√3

Answer 2

Kita punya :
sin(x+y) = sin(x) cos(y) + cos(x) sin(y)
sin(60) = sin(30+30)
= sin(30) cos(30) + cos(30) sin(30)
= sin(30) cos(30) + sin(30) cos(30)
= 2 sin(30) cos(30)