$\frac{-19x^2-6x^3+20}{x^2-2x-3}$
$2x+4=-6x-12$
$\frac{2cos\left(x\right)}{sin\left(x\right)}$
$1000\cdot5.340$
$tgx.\:ctgx.\:senx\:+\:cosx.\:secx\:-\:1$
$72\sqrt{-8}$
$36-\left(4\cdot1\cdot16+2\cdot1\cdot9\right)$
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