$\frac{7x+1}{8x-2}$
$\left(\frac{1}{2}x+\frac{1}{5}\right)\left(\frac{1}{2}x-\frac{1}{2}\right)$
$y=\frac{-x^2}{2}+8x$
$\frac{-x-19}{\left(x^2+3x+19\right)^2},x$
$y=\left(\ln\left(\cos^2x\right)\right)^2$
$29-32-\left(16-8\right)$
$\int x\left(sen^2xcos^7x\right)dx$
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