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The equation of a curve is 2x4 + xy3 + y4 = 10. i) Show that...

The equation of a curve is 2x4 + xy3 + y4 = 10.
i) Show that dy/dx=(8x3+y3)/(3xy2+4y3).

ii) Hence show that there are two points on the curve at which the tangent is parallel to the x-axis and find the coordinates of these points.

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