Question

if cos 30 degree is equal to root 3 by 2 then find the value of sin 15 degree

Answer 1

sin 15°
= sin (45-30)
= sin45°. cos30° - cos45°. sin30°
= 1/√2 × √3/2 - 1/√2 × 1/2
= (√3-1)/2√2