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x² - 16y² = 16
refleksi thd y + x = 0 ---> y = -x
(x , y) ---> (-y , -x)
x' = -y
y' = -x
Bayangan :
x² - 16y² = 16
(-y')² - 16(-x')² = 16
y² - 16x² = 16 ✓