Drive an equation of the tangent plane to the surface

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Reference no: EM131013756

1. Determine whether the function is a solution of Laplaces equation u_xx u_yy =0.

u= ln(x² - y²) + 2 tan^-l(y/x).

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

Reference no: EM131013756

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