9. The pollution concentration at a lake follows the expression /(x, y,=) =0.01 e(**)*=). Determine the vector pointing to the direction of greatest pollution increase at the point (1, 2,3) . And then use the direction cosines to determine the 3 direction angles. 10. The wind speed profile at a particular location is defined as W(x, y) =50-x -4y. A sensor is placed at (2,-1). What direction of largest wind increase will the sensor detect? Relative to North, what is this direction in degree