$\frac{dy}{dx}=y^2+y+1$
$x\frac{dy}{dx}+2y=3x^2+2x$
$4 x ^ { 10 } - 36 \times 5 + 81$
$a^2-24x^2a^2+ab^2$
$\left(secxcscx-tanx\right)senx$
$\left(3^a-2b\right)^2$
$\lim_{x\to\infty}\frac{2x+1}{4x^2+x}$
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