Two waves are represented by y1=asinωt+π6 and y2=acosωt. What will be their resultant amplitude

(1) a

(2) 2a

(3) 3a

(4) 2a

(3) A=(a12+a22+2a1a2cosϕ)

Putting a1 = a2 = a and ϕ=π3, we get A=3a

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