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For the following exercises, find the directional derivative using the limit definition only. 262. Find the directional derivative of (x, y) = ysin (2x)

For the following exercises, find the directional derivative using the limit definition only. 262. Find the directional derivative of (x, y) = ysin (2x) at point P (1, 2) in the direction of u = 5i + 12j.

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