1. Find all the solutions of the equation in the interval

_{2cos2x-2sin2x=1}

2. Two ships leave port at 4 p.m.One is headed at a bearing of N 38 E and is traveling at 11.5 miles per hour.The other is traveling 13 miles per hour at a bearing of S 47 E.How far apart are they when dinner is served at 6 p.m.? (set up and solve for d but do not simplify) (10 points)