Give the expression for resultant displacement of two waves producing beats.

Explanation

`y ( t) = 2 a cos [ ((omega_(1)-omega_(2))t)/(2)]cos[((omega_(1)+omega_(2))/(2))t]` where `y_(1)= acos omega_(1) t ` and `y_(2) a cos omega _(2) t ` and `y =y_(1)+y_(2)`