$16-\left(-25-\left(1+2\right)\right)$
$-6x-2+4x-9$
$sin\alpha\:\left(sin\left(2\alpha\:\:+3\beta\:\right)\right)+cos\alpha\:\left(cos\left(3\beta\:+2\alpha\:\right)\right)$
$\left(m-9\right)\left(m+9\right)$
$9y\:+\:4y\:-\:2y\:+\:y\:+\:y^2$
$x^2+12x+3$
$b^2-30b+30$
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