$\left(-2\right).\left(-6\right)+10.\left(-3\right)$
$2-\left(-16\right)$
$t^4+31=20$
$\lim_{x\to\infty}\left(8x^2+4x+3\right)$
$sinx+sin60\:-cos30\:+cosx\:=\:1$
$2\cos^2x-4\cos x-3$
$562+\left(-352\right)+801+47$
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