$\log_x\left(x^2-1\right)=\log_x\left(3x-3\right)$
$\:0,09y^2-1$
$-6785+190$
$\int\frac{x}{\left(x+1\right)\left(x^2+1\right)^2}dx$
$\int\left(\pi sec^2\left(\pi x\right)\right)dx$
$\frac{x^4}{x^2+9}$
$\left(a^4b^{-5}\right)^4$
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