$x^2-8x-12$
$\int\left(x+4\right)e^{-5x}dx$
$\int\left(\frac{csc^2x}{cot^4x}\right)dx$
$7x+2mn+3mn-7x$
$\left(5.3\right)^2$
$-2x=5y+10$
$tan\theta\:\:sen\theta\:$
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