1. The problem statement, all variables and given/known data P1 sin 2x + sqrt(2) sin (x - (pi/4)) = 1 P2 Two sides of a triangle are 5cm and 9cm long. The ratio of the opposite angles is 1:3. Determine the angles and the length of the third side of the triangle! 2. Relevant equations sin(2&) = 2 sin&cos& sin(& - §) = sin& cos§ - cos& sin § 3. The attempt at a solution P1 With this problem I'm stuck at: sin 2x + sqrt(2) sin (x - (pi/4)) = 1 sin 2x + sqrt(2) (sinx (1/2)sqrt(2) - cosx (1/2)sqrt(2)) = 1 sin 2x + sin x - cos x = 1 2 sinx cosx + sin x - cos x = 1 Here I have the equation in one angle, but not in one function. I guess I need to do some changing etc. But I really can't figure out where to start. P2 Two sides are given and a ratio of opposite angles. I do not even know where to start on this one...help is greatly appreciated!