$12x-8<12x-10$
$x\left(x+1\right)y'-y=2x^2$
$432\:+223$
$\frac{3+17x^2}{\left(4x+1\right)\left(x^2+4\right)}$
$7x^3+5^2+3x-2\:\:\:x^2-2x-1$
$\frac{1}{\tan^2a+1}+\frac{1}{\cot^2+a+1}$
$\frac{2y^3}{\left(2xy\right)^4}$
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