please I need help I don't know how to solve this!!!!!! 11/18/2013 | Esmeralda from South Gate, CA | 1 Answer | 0 Votes Mark favorite Subscribe Comment
x/2 is in quadrant 2. Therefore, cos(x) = -sqrt(8)/3, sin(x/2) = sqrt[(1/2)(1-cosx)] = sqrt[(1/2)(1+sqrt(8)/3)] 11/18/2013 | Robert J. Comment