$1\left(2x-3\right)^3$
$8-2\cdot\left(2+3\right)-2\cdot2+3$
$\cos2a\:-\:cos\:6a$
$5b+3b-19$
$5x^2+3=-2$
$-3-4-6-11+4+8+9-10$
$49x^2y^8-x^2y^3$
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