$19-8\left(-2\right)\left(-3\right)-\left(-23\right)$
$\frac{3x^2}{6x^2+3}$
$\sqrt[10]{x^{11}}$
$2\left(x\cos a-y\sin a\right)\left(x\sin a+y\cos a\right)$
$-6+9+3-6+4-1+5-3+6$
$x^3+9x^2+24x+20$
$321+122$
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