$\int\:\:\frac{1}{x\sqrt{4x^2+81}}\:dx$
$\int sen\left(ax\right)cos\left(bx\right)dx$
$25^2$
$\left(\sqrt{x-1}\right)\left(x^2+4\right)$
$x^2-16x+91$
$apc_{al_{a}}$
$\frac{dy\left(t\right)}{dt}+y\left(t\right)=\sin\left(t\right)$
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