$sinx=0.755$
$\left(3xy^2+5xy\right)\left(2xy^2-3xy\right)$
$\lim_{x\to0}\left(\frac{\sqrt{81+sinx}}{x}\right)$
$a^3-b^3=28$
$200+\left(50\right)+800+\left(-200\right)+\left(-30\right)$
$6\left(8-10\right)-9$
$1.84-\left(-3.9\right)$
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