$4.5+7+2$
$\left(x-2+y\right)\left(x+3\right)$
$\left(3x-2y^3\right)\cdot\left(3x+2y^3\right)$
$-40x^5+50x^5$
$\frac{\sin x\left(\sec^2x-\tan^2x\right)}{cscx}$
$8x^2-32x+17$
$\frac{2}{10}a+\frac{3}{10}b-\frac{1}{5}a+\frac{3}{5}b$
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