$\left(2x+3y\right)\left(3x+2x\right)$
$3cosxsinx=-sinx$
$\sqrt{64a^7b^3}$
$x^2-2xy+yx-2y^2$
$1-8x=4x^2$
$3\cdot\left\{2\cdot\left[4-2\cdot\left(5-7\right)+3\cdot\left(1-2\cdot5\right)\right]\right\}$
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