$7^4+7^5$
$\left(5+ab\right)\left(5-ab\right)$
$10x=5x+20$
$\int x\cdot\text{sen}^3\left(\frac{ax^2}{b}\right)dx$
$-100+300+475+-200+-250+500$
$\int_1^4\left(\frac{1}{\left(4-x\right)^2}\right)dx$
$\int2\pi x\sqrt{x^2+1}dx$
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