$7x^2-29x-30$
$\lim_{n\to\infty}\left(\frac{2n+1}{n^2}\right)$
$31.43270856+90$
$\frac{7x}{x-2}+7=2x-2$
$\frac{d}{dx}\left(lg\:e^{xz}\right)$
$6a+8b$
$\lim_{x\to1}\left(\frac{3x^2+2x-1}{2x-1}\right)$
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