$2senx-1=senx$
$8-\left(-2\right)-\left(+3\right)+\left(-1\right)$
$\left(3\right)-\:\left[\left(-2\right)-\:\left(-5\right)\right]$
$3+4-5+6-2-1$
$\left(\frac{7}{3}-\frac{2}{5}\right)x^2$
$\frac{dy}{dx}=xy-2x+y-2$
$5\sqrt[3]{27}$
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