$\lim_{x\to\frac{\pi}{2}}\left(2cos\left(-3x\right)sec\left(-7x\right)\right)$
$x^2-2x=x^2$
$6x^2-8x+1$
$3y^2+24y$
$2k^2-2k-k-2$
$-8x+x+3x-x$
$4m^2-48m+144$
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