Question

Can someone check this one for me , thank you!

Answer 1

Answer:

C

Step-by-step explanation:

Using sum/difference to product identity

• sin x - sin y = 2 cos($\frac{x+y}{2}$) sin ($\frac{x-y}{2}$)

with x = 4Θ and y = 2Θ

Then

sin(4Θ) - sin(2Θ)

= 2 cos($\frac{4o+2o}{2}$) sin($\frac{4o-2o}{2}$)

= 2cos(3Θ)sinΘ → C