# Calculus

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

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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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