$1\lim_{x\to-3}\left(2x^2+4x+1\right)$
$\left(-2a+b\right)\left(4a-3b\right)$
$x^3+3x^2cx+3x\left(cx\right)^2\left(cx\right)^3$
$\cot^20\left(1+\tan^20\right)+\csc^20$
$x^2-12x+36=36$
$g^2+a^2-2g^2-4ga$
$-2\left(-2y+2\right)-y$
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