$\int\left(\frac{9}{x}\right)dx$
$\frac{1}{2}+x+2z^2\:\:si\:x=3\:y\:z=5$
$3\cdot2-25$
$\int\frac{x+5}{x^2-7x+6}dx$
$\int\sqrt{5x-7}dx$
$\left(y-10\right)\left(y-5\right)$
$tan\:\left(67\right)-\frac{sin\left(67\right)}{cos\left(67\right)}$
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