Evaluate
\frac{|a|\left(ab\right)^{2}+|b|\left(ab\right)^{2}+|a|b^{2}+|b|b^{2}-|a|a^{2}-|b|a^{2}+a^{2}+b^{2}}{\left(|a|+|b|\right)\left(a^{2}+b^{2}\right)}
Differentiate w.r.t. a
\frac{|a|sign(a)\left(ab\right)^{2}+|b|sign(a)\left(ab\right)^{2}-|a|sign(a)a^{2}b^{4}-|a|sign(a)b^{2}a^{4}-|b|sign(a)a^{2}b^{4}-|b|sign(a)b^{2}a^{4}+b^{2}a^{5}+|a||b|b^{2}a^{3}+5a|a||b|b^{4}-2sign(a)\left(ab\right)^{2}+|a|sign(a)a^{4}+|b|sign(a)a^{4}+3a^{3}b^{4}+2ab^{6}-|a||b|a^{3}-sign(a)a^{4}-sign(a)b^{4}-9a|a||b|b^{2}-5b^{2}a^{3}-4ab^{4}-a^{5}}{\left(\left(|a|+|b|\right)\left(a^{2}+b^{2}\right)\right)^{2}}
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