Evaluate
-56\sqrt{2}v
Differentiate w.r.t. v
-56\sqrt{2}
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-4\times 14\sqrt{2}v
Factor 392=14^{2}\times 2. Rewrite the square root of the product \sqrt{14^{2}\times 2} as the product of square roots \sqrt{14^{2}}\sqrt{2}. Take the square root of 14^{2}.
-56\sqrt{2}v
Multiply -4 and 14 to get -56.
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