$+7\:-\:\left[\:+1\:-\:\left(\:+10\:\right)\::\:\left(\:+5\:\right)\:\right]\:$

$\lim_{x\to\infty}\left(\frac{\left(e^x-1\right)}{\left(x^2+x\right)}\right)$

$e^x\left(e^{2x-2}\right)-3e$

$\lim_{x\to1}\:\frac{x^2-1}{t-1}$

$\frac{1}{x+8}\:,\:c=2$

$\lim_{x\to1}\left(\frac{x^2-3x}{x}\right)$

$\lim_{x\to0}\left(\frac{e^{-x^2}-1}{tan\left(x^2\right)}\right)$