Question

Find the value of 8 sin 2x, cos 4x, sin 6x, when x = 15°

Answer 1

8 sin 2x cos 4x sin 6x = 8 sin 2(15°) × cos 4(15°) × sin(6 × 15°)

= 8 sin 30° × cos 60° × sin 90°

= `8 xx 1/2 xx 1/2 xx 1`

= 2