$\lim_{x\to4}\left(\frac{x^2-4}{3-\sqrt{x+7}}\right)$
$\int\arcsin\left(8x\right)dx$
$8^{-5}\cdot8^6$
$4x^2+12x-9+10x-15$
$5x^2\:-\:5x\:+\:1$
$\left(d-8\right)\left(d+8\right)$
$\frac{4x+6}{2x+3}$
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