$\lim_{x\to-\infty}\left(\frac{2x^4}{3x^3-4}\right)$
$x+4>4$
$-x+3>7$
$\int\frac{\left(5x^2\right)}{\sqrt{x^2-49}}dx$
$6^{x+1}=-37$
$\frac{cos\:x}{sen\:x\:}+\:sen\:x=csc\:x$
$-63x^2-4x^6-16x^4$
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