hitunglah sin 280 derajat beserta caranya

Sin 280= sin(120°+60°)
sin120.cos 60+cos 120.sin60 --> memakai identitas trigonometri

1/2√3 . 1/2 + (1/2) . 1/2√3
=1/2√3 + 1/2 √3
= 1/2 (√3+√3)

[tex] \frac{1}{2} (2 \sqrt{3} ) = \sqrt{3} [/tex]



semoga membantu