$x^{2}+16z^{2}+x-32z-16y-15=0$
$30\cdot10-180+60+13$
$\int\frac{x+14}{x^2-2x-8}dx$
$6am33bm+6an+3bn$
$6x+3y-4x+5-7y$
$\lim_{x\to0}\left(\frac{1}{x^4+2x^2}\right)$
$\frac{\sec x^2-1}{\sin^2x}=\sec^2x$
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