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Find Duf at P f(x,y)= sin(3x-4y); P(4, 3); u=(3/5 i-4/5 j) Enter the exact answer. Duf=?

Find Duf at P

f(x,y)= sin(3x-4y); P(4, 3); u=(3/5 i-4/5 j)

Enter the exact answer.

Duf=?

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