$\left(2x-3xy\right)^2$
$-\left(-5+10\right)-\left(-13-5\right)-5$
$x^6+2x^6$
$2\cdot\left(-56\right)$
$89-46.347$
$-907+368$
$4cos^2x+2sin^2x-3=cos2x$
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