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If y=e^(-x)cosxa n dyn+kn y=0,w h e r ey...

If `y=e^(-x)cosxa n dy_n+k_n y=0,w h e r ey_n=(d^n y)/(dx^n)a n dk_n` are constants `AAn in N ,` then (a)`k_4=4` (b) `k_8=-16` (c)`k_(12)=20` (d) `k_(16)=-24`

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