Math Help - simplify the experession

use the addition and subtraction formulas to simplify the experession

sin(x+y)sin(x-y)
write the answer in terms of sin x and cos y only

Originally Posted by cm3pyro

use the addition and subtraction formulas to simplify the experession

sin(x+y)sin(x-y)
write the answer in terms of sin x and cos y only

and ...now apply that

i did ..but i am coming up with the worng answer.

Originally Posted by cm3pyro

i did ..but i am coming up with the worng answer.

well since I am sure you know that we have that case here...except in reverse...so it should be