Four different independent waves are represented by
i) y1=a1 sin ωt
ii) y2=a2 sin 2ωt
iii) y3=a3 cos ωt
iv) y4=a4sin(ωt+π3)
With which two waves is the interference possible?
Insufficient data to predict.
Since the sources are independent, interference will not occur unless they are coherent (such as laser beams etc). So, insufficient data to predict.