$64x^2-16y^2$
$\left(n-\frac{1}{3}\right)\left(n+3\right)$
$\lim_{x\to\frac{\pi}{2}}\left(6cos\left(-3x\right)sec\left(-7x\right)\right)$
$\frac{2}{5}+\frac{3}{5}$
$a+5a+5$
$5x-11y-9+20-1-y$
$-0,23+-1,1$
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