if x=at^2 and y=2at then x+y,x-y is
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x + y = at² + 2at
x + y = at (t + 2)
x - y = at² - 2at
x - y = at (t - 2)
x + y = at (t + 2)
x - y = at² - 2at
x - y = at (t - 2)
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