$\lim_{x\to0}\left(\frac{x^3}{a}\right)$
$\left(-2x^2+2\right)$
$\lim_{x\to\infty}\sqrt{\frac{1+x}{x^2}}$
$\lim_{x\to0}\:x^4e^{-x^3}$
$4cos^2\left(x\right)-cos\left(x\right)-3=0$
$\left(2c+5\right)\left(2c+7\right)$
$169^2-4u^2$
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