9709 P33 - Nov 2021 - Q7
1672
The equation of a curve is \(\ln(x+y) = x - 2y\).
(a) Show that \(\frac{dy}{dx} = \frac{x+y-1}{2(x+y)+1}\).
(b) Find the coordinates of the point on the curve where the tangent is parallel to the \(x\)-axis.
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