$\left(0\right)-\left(1500-1200-2700\right)$
$144w^6x^4-169z^2$
$x^2-8x+1$
$125-729-256$
$\left(13x-2y\right)^2$
$\cos\left(2\right)a=1-2\sin^2a$
$r+5\le11$
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