The temperature at a point (x, y) on a flat metal plate is given by T(x, y) = 45/(8 + x2 + yz), where T is measured in C and x, y in meters. Find the rate of change of temperature with respect to distance at the point (1, 2) in the x-direction and the y- direction. (a) the xdirection \"C/m (b) the y-direct' on \"C/m Find all the second partial derivatives. f( x, y) = x8y9 + 9xy fxx (x, y) = fxy (x, y) = fyx (x, y ) = fyy (x, y) =