Please provide a step by step solution for the following so

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Find the equations of the planes tangent to the following surfaces at the specied points: (a) The surface 2xy +m=."'Z = 5 at the point (1. 2. 0). (b) The surface 2 = 4cos{x y) + 1 at the point (, ,3). . Consider the function f(x_ y) = ln(1 + 2): +3!2 +y). (:1) Estimate f(0.1.0.2). (b) Approximate the change in 2 when (x, y) changes from (0,0) to (0.05.0.1)