" 3.If "y=e^(-kt)cos(lt+c)," show that "(d^(2)y)/(dx^(2))+2k(dy)/(dx)+n^(2)y=0," where "n^(2)=k^(2)+l^(2)

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If y=Ae^(-kt)cos(pt+c), then prove that (d^(2)y)/(dt^(2))+2k(dy)/(dx)+n^(2)y=0, where n^(2)=p^(2)+k^(2)

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