$2x^2-3x-1$
$18n-7-2n$
$3\cos\left(2x\right)+4\sin\left(^2\right)x$
$\int_x^3\left(y\right)dx$
$\frac{15x-4}{2}<1+6x$
$x^2-20\times\:100$
$\frac{dy}{dx}=\frac{2y}{x+4}$
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