$\lim_{x\to3}\left(\frac{x^3-4x^2+x-6}{x-3}\right)$
$7x^2-10xy-7-4x^2-9xy+6$
$\frac{56.060}{21.000}$
$\frac{1}{cosx}+\frac{1}{cotx}$
$18.7-5.46-3.418$
$\frac{15}{0.37}$
$\int sec\left(u\right)tan\left(u\right)du$
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