$\frac{3^{x+1}+3^x}{2\cdot9^x}$
$-3xy^2,7y^2x,xy^2$
$\int\frac{2x^2-1}{x^3+x^2}dx$
$\int usin\left(u\right)du$
$\frac{dy}{dx}+\left(2x-1\right)y=0$
$\log\left(\frac{m^4}{n^5}\right)$
$x-1^4$
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