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Answer: (a) 30 degree.
Explanation: The Resultant wave = E1+ E2
E1 = Eo Sint
E2 = Eo Sin(t+60ᶞ)
E = E1 +E2
= Eo (sint +( sint + 60ᶞ)
by mathematically we get
E= 2Eocos(wt) sin(wt+30).