Trigg help!

1. Nov 25, 2008

TayTayDatDude

1. The problem statement, all variables and given/known data
Use the appropriate compound angle formula to express the following as a single trigonometric function and then determine the exact value

2. Relevant equations
(sin2pi/3)(cospi) + (cos2pi)(sinpi)
sin[(2pi/3) + pi]

3. The attempt at a solution

unsure if it's right

Last edited: Nov 25, 2008
2. Nov 25, 2008

Dick

What compound angle formula are you trying to use?

3. Nov 26, 2008