Calculus

A function y with the property that y = -y′' is?

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asked by Anonymous
  1. suppose y = -e^-x
    y' = e^-x
    y'' = -e^-x = y

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    posted by Reiny
  2. Hmmm. we wanted y" = -y
    Let y = sinx
    y' = cosx
    y" = -sinx = -y
    also holds true for y=cosx.

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    posted by oobleck

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