" 9f "y=e^(-x)cos x*" show that "(d^(2)y...

" 9f "y=e^(-x)cos x*" show that "(d^(2)y)/(dx^(2))=2e^(-x)" stns "

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If y=e^(-x)cos x, show that (d^(2)y)/(dx^(2))=2e^(-1)sin x

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