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y= -y'
⇒ y = x²-3
⇔ -y = x²-3
2) x = 1/2 x'
y= 1/2 y'
⇒ -y = x²-3
⇔-1/2 y' = 1/4 x'²-3
⇔ -y' = 1/2 x'²-6
⇔ y' = 6 - 1/2 x'² D