$x^2+21x+20\:=0$
$\cos\left(x\right)-2=1$
$-703\:+\:-680$
$1-125a^3b^3$
$\lim_{x\to\frac{\pi}{4}}\left(\frac{tan\left(x\right)}{cos\left(x-\frac{\pi}{4}\right)}\right)^{\frac{1}{sen\left(x-\frac{\pi}{4}\right)}}$
$153.938-113.0973$
$\int\frac{4y-2}{y^3-y^2-2y}dy$
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