Fd an equation of the tangent plane to the surface z


1. Determine whether the function is a solution of Laplaces equation uxx uyy =0.

u= ln(x2 - y2) + 2 tan-l(y/x).

2. Find an equation of the tangent plane to the surface z = ex^2-y^2, at the point(1, -1, 1).

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Mathematics: Fd an equation of the tangent plane to the surface z
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