$-1\:\lim_{x\to0}\left(\frac{x}{\sin x}\right)$
$4x-3x^{-1}+5+5x-3+4-3x^{-2}$
$\sqrt{\frac{348m^3n^9}{147m^2n^{11}}}$
$\left(\frac{3}{4}m+\frac{6}{5}a\right)^2$
$\lim_{x\to\:\infty}\sqrt[3]{8+x^2}$
$y'\:+\:xe^y\:=\:0$
$a-5a+2a$
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