Find fx.f(x, y) = x19 - 5x3y23 + 4y-7

A. 19x18 - 5x3y23 + 4y-7
B. 19x18 - 15x2y23
C. 19x18 - 15x3y22 - 28y-8
D. 19x18 - 15x3y23


Answer: B

Mathematics

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