$0.3y+0.7=0.85$
$\left(-a\right)\left(a^6\right)$
$\left(a^3-5\right)^2$
$\int\cot\left(x+1\right)dx$
$\frac{x^2+1}{x-3}$
$\frac{x^2-2x+1}{x^2-2}$
$3-0,48+1$
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