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In what directions is the derivative of f(x,y) = xy + y^2 at P(9,1) equal to zero?
In what directions is the derivative of f(x,y) = xy + y^2 at P(9,1) equal to zero?
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Thomas Calculus Early Transcendentals
Authors: Joel R Hass, Christopher E Heil, Maurice D Weir
13th Edition
978-0321884077, 0321884078
