( 2 \sqrt { a b } ( a ^ { 2 } - b ^ { 2 } ) + b ^ { 3 } ( a - 2 b )
Evaluate
\left(a-2b\right)b^{3}+2\sqrt{ab}\left(a^{2}-b^{2}\right)
Differentiate w.r.t. a
\frac{b\left(|\frac{b}{a}|b^{2}+\sqrt{ab}+4\sqrt{\frac{b}{a^{3}}}a^{2}-\sqrt{\frac{b}{a^{3}}}b^{2}\right)}{|\frac{b}{a}|}
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