$\frac{19^{7}\cdot19^{-5}}{19^{4}}$
$-\frac{\left(-105m^2n^4+63mn-18\right)}{-3mn}$
$\frac{14}{6}-\frac{1}{3}$
$\left(40m+12y\right)^2$
$\int cos\:\left(3t\right)\cdot sen\left(2t\right)dt$
$\int4\tan^3\left(\frac{x}{5}\right)\sec^3\left(\frac{x}{5}\right)dx$
$3s-4s$
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