In Problems 1-5, find the directional derivative of ( at the point p in the direction of

Question:

In Problems 1-5, find the directional derivative of ( at the point p in the direction of a.
1. ((x, y) = x2y; p = 1, 2); a = 3i - 4j
2. ((x, y) = y2 ln x; p = 1, 4); a = i - j
3. ((x, y) = 2x2 + xy - y2; p = (3, -2); a = i - j
4. ((x, y) = x2 - 3xy + 2y2; p = (-1, 2); a = 2i - j
5. ((x, y) = ex sin y; p = (0, (/4); a = i + (3j