a f(x, y) = x ln(y) at P(1, -3) b f(x, y, z) = xe2yz at P(3,0, 2) a \( f(x, y)=x \ln (y) \) at \( P(1,-3) \) b \( f(x, y, z)=x e^{2 y z} \) at \( P(3,0,2) \)Find the directional derivative of \( f \) at the given point in the direction indicated by the angle \( \t 0 answers