$cos\:2x\:+\:3\:cos\:x\:+1=0$
$-5^2+31$
$\left(x^3+3x\right)^3$
$\left(20y+45\right)\left(20y-45\right)$
$-2-4-1\left(-3\right)$
$\sqrt{1521}$
$158+72$
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