$2\left(-2-\left(-3\right)\right)+5$
$cos3x\:=\:-1$
$x-3=y$
$-2y^2+2y$
$9x^2-6xy+x^2$
$\left(10\right)^3+\left(xy\right)^3$
$-2\left(a+3\right)-4\left(a-2\right)$
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