$-203\:-475$
$\int\frac{3}{\left(2-x\right)^2\left(x-1\right)}dx$
$\frac{sec\:x}{csc\:x}=sen\:x\:csc\:x$
$-2-3\cdot2$
$u^2-5u$
$n^2+17n+72$
$10y^2-20-4$
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