Compute the partial derivative: f(x, y) = sin(x5-by) fy(0, ) = (10 points) Find the partial derivative indicated. Assume the variables are restricted to a domain on which the function is defined. z = sin(6xy 7xy). Zz = (10 points) Let z = 4x + 2y. Then: The rate of change in z at (4,1) as we change but hold y fixed is The rate of change in z at (4,1) as we change y but hold a fixed is 7 and