Question

formula for sin(a+b)*sin(a-b)​

Answer 1

Answer:

sin(A + B) = sinA cosB + cosA sinB sin(A − B) = sinA cosB − cosA sinB cos(A + B) = cosA cosB − sinA sinB cos(A − B)

Answer 2

Step-by-step explanation:

sinA cosB

Since sin(A+B) = sinA cosB + cosA sinB

and sin(A-B) = sinA cosB - cosA sinB

So if you add them together you just get 2 sinA cosB, because the back terms cancel each other out