the question is complete

1. Functions of Several Variables Evaluate the following functions at the specified points and find their domains. a) z = f(11, 12) = In ({x1 - 3}2) + In ({x2 - 4}2) at (4, 5) b) z = f(X1, 12, 13) = mir, + 1243 - 143 at (0, 1, 2) 2. PartiaDeriativefor Functionof 2 Variables a) Find the 1st- and 2"d-order partial derivativesof the following function and organize your 2" -order partialsin an easy to read format. z = f($1, 12) = ex132 b) Find the 1$-order partial derivatives of the following function and verify that the 2nd-order derivatives f12 and fo are equal. z = f(21, 12) = (xi+25) 10