Question

If A = 15°, verify that4 sin 2a. Cos 4a sin 6a

Answer 1

If A = 15°
then
L.H.* = 4 sin2a. Cos4a sin6a
= 4 sin(2x15°). Cos(4x15°). sin(6x15°)
= 4 sin30°. Cos60°. sin 90°

place the value of each respective trigonometric function:
= 4 X 1/2 X 1/2 x 1
= 1 = R.H.S