$\left(9x^4-2y^3\right)\left(9x^4+2y^3\right)$
$6-4:2-5.3+6:2.2$
$2xy'-y=x^3-x$
$\int\frac{x+1}{x\cdot\left(x-1\right)\cdot\left(x+1\right)}dx$
$3^x-3^{x+1}+3^{x+2}=189$
$\frac{d}{dx}2^{5-x}$
$y^2=e^{Cx}$
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