Step 1 :\sin{(x+11)^{\circ}}=\cos{(90^\circ-(x+11)^\circ)}
Step 2 :\cos{(90^\circ-(x+11)^\circ)}=\cos{(2x+22)^\circ}
Step 3 :90^\circ-(x+11)^\circ=2x+22^\circ
Step 4 :x=\frac{57^\circ}{3}