$-49\:.\:2$
$1-\left(sin\theta\:-cos\theta\:\right)\left(sin\theta\:\:-cos\theta\:\right)$
$y\left(4-x\right)dx+\left(x-2\right)dy=0$
$\lim_{x\to0}\left(\frac{x^2-9}{x\:-\:3}\right)$
$x^2-256$
$sin\left(x\right)=-\frac{5}{13}$
$x+\frac{27}{2x^2}$
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