Question

Nilai 2(sin50 cos40 + cos80 sin 70) berapa ya?

Answer 1

Verified answer

TriGonoMetRi

2 sin 50 cos 40 + 2 cos 80 sin 70
= sin (50+40) + sin (50-40) + sin (80+70) - sin (80-70)
= sin 90 + sin 10 + sin 150 - sin 10
= 1 + 1/2
= 3/2