$x^2-28x+25=0$
$9n+12n+7$
$\lim_{x\to-\infty}\:x^2e^{5x}$
$\lim_{x\to2}\left(\frac{\sqrt{6x-3+2x}}{5x-7}\right)$
$\left(4d-3\right)\left(4d+9\right)$
$\left(3x+4y-z\right)^2$
$\frac{\sin\:\left(2x\right)+2\cos\left(x\right)}{1+\sin\left(x\right)}$
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