Evaluate
4\left(xy\right)^{2}
Differentiate w.r.t. x
8xy^{2}
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\frac{1}{8}x^{2}\times 32y^{2}
Multiply 2 and \frac{1}{16} to get \frac{1}{8}.
4x^{2}y^{2}
Multiply \frac{1}{8} and 32 to get 4.
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