Find all second-order partial derivatives. Determine which of the following functions are solutions to Laplace's Equation. (a) f(x,y) = x² – y? (b) f(x, y) = x² + y? (c) f(x,y) = ln[(x² + y²)²] (d) f(x, y) = e-" cos(y) – e-Y cos(x) (e) f(x,y) = e-" sin(2y) (f) f(x, y) = In[cos(x – 2y)] -

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