Find solutions for Sin(2x)-Sin(x)-Cos(x)+1=0

I have been trying to come up with my own ways but I keep failing =\

I tried squaring both sides after moving cos(x) to the other side ... I tried making 1 = Sin^2(x)+Cos^2(x) and solving it out .. But I just cant get it right !!!!

Any help please ?

Really appreciated

Thanks