1.

If y = e^(x) cos x and y_n + k_n y = 0 , where y_n = (d^n y)/(dx^n) and k_n are constant AA n in N, then

Answer»

`k_4 = 4`
`k_8 = -16`
`k_12 = 20`
`k_16 = -24`

ANSWER :A::B


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