Q.5 the tangent plane to the surface z = yx2 + 3y2 at (1, 1,2) is given by (a) x-3y +z = 0 (b)x +3y 2z = 0 (c) 2x +4y -3z = 0 (d) 3x-7y +2z = 0 am 2018 mathe q.

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