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Problem 1. Find an equation of the tangent plane to the given surface at the specified...

Problem 1. Find an equation of the tangent plane to the given surface at the specified point. i) z = 2x 2 + y 2 − 5y, (1, 2, −4). ii) z = e x−y , (2, 2, 1). iii) z = x sin(x + y), (−1, 1, 0)

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