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(x,y) dicerminkan thp y = 3 maka bay = (x, 2.3 - y) = (x, 6 - y)
artinya x = x' dan 6 - y = y' => y = 6 - y'
bay dr y = x^2 + 2x + 1 adalah
=> 6 - y' = (x')^2 + 2x' + 1
=> -y' = (x')^2 + 2x' - 5
=> y = -x^2 - 2x + 5