Find the first 4 positive solutions to each equation. (Use unit circle to make sense of each equation).
1. is quite easy, just draw a circle and make it go around twice i.e. 720 degrees. and find values in 3rd/4th quad i.e 210. and equate it too 2@ and solve for 4 positive values. 165,105,285,345
2. re-arrange the surd thing to get cos2@=cos@, and draw a graph of both and find intersections that are positive. it seems easier to me than using a circle. 0,120,240,x. i didnt bother drawing the rest up
3. good luck. no idea