find the tangent plane to the surface z = tan-1 y/x at the point (1,1)

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You need to remember the equation of tangent plane, at a point `(x_0,y_0), ` such that:

`z = f(x_0,y_0) + f_x(x_0,y_0)(x - x_0) + f_y(x_0,y_0)(y - y_0)`

You need to evaluate the partial derivatives of the function `z =...

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