$\frac{d^2}{dx^2}=-\frac{49}{y^3}$
$2+x-y+3z+y-2x+6$
$100-s^2$
$\left(12a^2-3b^2-4c\right)^2$
$tan^2\left(3t\right)sec^2\left(3t\right)$
$-1.7+9.3\:$
$x^2-8x+15<0$
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