$11.21\left(4\right)$
$5a^2b-7ab^2$
$\frac{\sin\left(a\right)}{1+\cos\left(a\right)}+\cot\left(a\right)=\cos\left(a\right)$
$\frac{dy}{dx}=xy^2-x-y^2+1$
$xy+2y=\sin\left(x\right)$
$0,06\cdot0,5\cdot0,1$
$m\left(2a+b\right)+u\left(2a+b\right)$
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