Question

Sin 7y cos 3y - cos 7y sin 3y

Answer 1

Answer: sin(4y)

Explanation:

This can be answered by using the formula

`sin(a-b) = sin(a)cos(b)-cos(a)sin(b)`

In this case, a is 7y and b is 3y so this equation can be simplified to

`sin(7y-3y)=sin(4y)`