$-\left(3\right)\:x\:\left(+50\right)$
$-1+\left(-19\right)+\left(-8\right)+\left(-3\right)$
$\left(-12\right)\cdot\left(5\right)\cdot\left(-9\right)\cdot\left(-8\right)\cdot\left(25\right)$
$2x+4>3x-18$
$sin^2\left(\frac{7}{10}\right)+cos^2\left(t\right)=1$
$cos\left(x+2\pi\right)=cos\left(x\right)$
$2ydx+5xdy=0$
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