$\frac{y}{x}\cdot\frac{dx}{dy}=-\frac{1}{2}$
$3\cdot5+3-2\cdot7+1$
$\left(a^{-4}b^{-3}\right)\left(a^3b^{-4}\right)$
$-6<\frac{2x-3}{4}$
$w^2-14wd+49d^2$
$\left(2x-1\right)\left(x^2+x-2\right)$
$\lim_{x\to0}45\left(\sin x\right)$
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