Question

Which expression is equivalent to cos(3x) sin x?

Answer 1

Answer:

Step-by-step explanation: I tried all the other options and this was the only correct one for me on Edmentum.

Answer 2

Answer:

$\frac{1}{2} [sin(4x)-sin(2x)]$

Step-by-step explanation:

Use the Product-Sum identity to turn cos(3x) sin x into a sum.

Formula: cos(u) + sin(v) = $\frac{1}{2}[sin(u+v)-sin(u-v)]$

Plug 4x and 2x for u and v into the formula: $\frac{1}{2}[sin(3x+x)-sin(3x-x)]$

Simplify: $\frac{1}{2}[sin(4x)-sin(2x)]$

:)