Find an equation of the tangent plane to the graph of z = f(2? cos(ry), e...

 

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Find an equation of the tangent plane to the graph of z = f(2? cos(ry), e" y) at (x, y) = (, 1) if f(-n, e") = -T, fi(-n², e") = and fa(-n²,e") = ет Find an equation of the tangent plane to the graph of z = f(2? cos(ry), e" y) at (x, y) = (, 1) if f(-n, e") = -T, fi(-n², e") = and fa(-n²,e") = ет