SOLUTION: 8sin(π/5)sin(π/3) I have an idea on how to solve this and got 4[Cos(2pi/15)-cos(8pi/15]. Please help Thank you

Algebra ->  Trigonometry-basics -> SOLUTION: 8sin(π/5)sin(π/3) I have an idea on how to solve this and got 4[Cos(2pi/15)-cos(8pi/15]. Please help Thank you       Log On


   

Question 950270: 8sin(π/5)sin(π/3)
I have an idea on how to solve this and got 4[Cos(2pi/15)-cos(8pi/15].
Please help
Thank you
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
8sin( pi/5)sin(pi/3)
I have an idea on how to solve this and got 4[Cos(2pi /15)-cos(8pi /15).
***
Product to sum identity:sinxsiny=%281%2F2%29%28cos%28x-y%29-cos%28x%2By%29%29
I believe you used this Identity to get the answer which is correct.