$11\cos\left(60\right)=x$
$\left(a+b-2c\right)\left(a-b+2c\right)$
$-4<x+1$
$10-15+\left(-9\right)-\left(-15\right)-12$
$4a^2b^2.3a^{-4}b^{-3}$
$x^2-12x+1$
$\left|25-3\right|$
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