Find an equation of the tangent plane to the given surface at the specified point: z = e^(x^2-y^2), (1,-1,1)

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You need to remember the equation of the tangent plane to a given curve, at a given point `(x_0,y_0,z_0)`  such that:

`z=f(x,y) = z_0 + f_x(x_0,y_0)(x-x_0) + f_y(x_0,y_0)(y-y_0)`

You need to find the partial derivative `f_x(x,y),`  hence, you...

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