$\lim_{x\to\:-13}\left(\frac{x^2-13}{x^2-169}\right)$
$\int\left(e^{3x^2-9}\cdot6x\right)dx$
$tg^2.ctg\:x.\:cos\:x=sen\:x$
$\int_3^{\infty}\left(\frac{x+12}{x^3}\right)dx$
$22x^2+12x^4+8xy$
$2\:x\:\left(-3\right)\:-\:\left(-7\right)$
$320\::\:\left(-5\right)$
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