Question

Slove sin120°???????????

Answer 1

→sin120°
=sin (90°-30°)
=cos30°
=√3/2

Answer 2

$\sin(120) = sin(90 + 30) \\ it \: will \: change \: into \: its \: co \: function \: i.e \: cos \\ sin(90 + 30) = cos30 = \frac{ \sqrt{3} }{2} \\ sin \: is \: positive \: in \: 2 \: quadrant \: astc \: rule$