SOLUTION: Find the exact value: Sin(Pi/18)cos(5Pi/18)+cos(Pi/18)sin(5Pi/18) i know its the sin addition formula but I'm lost on how to break this down into it. Can anyone help?

Algebra ->  Trigonometry-basics -> SOLUTION: Find the exact value: Sin(Pi/18)cos(5Pi/18)+cos(Pi/18)sin(5Pi/18) i know its the sin addition formula but I'm lost on how to break this down into it. Can anyone help?      Log On


   

Question 422130: Find the exact value:
Sin(Pi/18)cos(5Pi/18)+cos(Pi/18)sin(5Pi/18)
i know its the sin addition formula but I'm lost on how to break this down into it. Can anyone help?
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Sin(Pi/18)cos(5Pi/18)+cos(Pi/18)sin(5Pi/18)
=sin(pi/18+5Pi/18)
=sin(6pi/18)
=sin(pi/3)=sqrt(3)/2