$\lim_{x\to-1}\left(2x-1\right)$
$3x^2-40x^2$
$4x^2+12x+60$
$7x+3x^2+12x^2$
$\frac{\sec\left(x\right)-\tan\left(x\right)}{\csc\left(x\right)-1}$
$\left(x\sqrt{x+3}\right)^2$
$\lim_{x\to\infty}\frac{\sqrt{2x^2+1}}{x+3}$
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