Question

Nilai dari 2 cos² 45° + sin 60° + cos 150° adalah...

Answer 1

2 cos² 45° + sin 60° + cos 150°
= 2 (cos 45° x cos 45°) + sin 60° + cos 150°
= 2 (1/2 akar 2 x 1/2 akar 2) + 1/2 akar 3 + (-1/2akar3)
=2 (1/4x2)
=2 (2/4)
=1