$2y''+12y'+18y=0$
$4x^2cosxsinx$
$2cot\left(2x\right)=\frac{1}{tan\:x}-\:tan\:x$
$67x^8y^3z+98x^8y^3z$
$x^2-8x-180$
$\frac{x^8}{x^8}$
$\int\frac{\left(3x^2-5x\right)}{\left(x-1\right)\left(x+1\right)^2}dx$
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