$n^2-81$
$81\cdot\frac{1}{3}$
$\frac{dy}{dt}=t-y$
$\left(3x^5+6y\right)^2$
$\left(x+4y\right)^3$
$\int\frac{\left(x+x^3\right)}{\left(x-a\right)^2}dx$
$tan4x=sin^2x+cos^2x$
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