$\frac { 7 a } { a }$
$\lim_{x\to0}\left(\frac{e^x+e^{-x}-2}{1-\cos\left(x\right)}\right)$
$\sqrt{\frac{20}{9}am^{18}x^2}$
$\frac{2x-3}{x^3+10x}$
$3^2+8x^3\cdot3$
$5\left(1\right)+1$
$4x^2+5x-4$
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