Sin 480°/sin 240° + cos 225° =

sin 480°/sin 240° + cos 225° =

Sin 480° = sin (1×360° +120°)
=sin 120°
=sin (180°-60°)
=sin 60°
=1/2 √3

Sin 240° = sin (180°+60°)
= -sin 60°
= -1/2 √3

Cos 225° = cos (180°+45°)
= -cos 45°
= -1/2 √2

Sin 480°/Sin 240° + Cos 225° =…
= (1/2 √3) / (-1/2 √3) + (-1/2 √2)
= -1 – (1/2 √2)

Semoga membantu, semangat terus belajarnya ya.. ????