$\int_1^t\frac{sen\left(u\right)}{u}\:du$
$\sqrt{\frac{7n}{5}}$
$ay-by$
$25x^2+20x+9$
$\lim_{x\to\infty}\left(-\frac{2}{x}\right)^{-x^2}$
$\sqrt{8}-\sqrt{8}$
$-19<5u+1$
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