$\cos^218+\sin^218$
$\left|7\cdot\left(-7\right)\right|-28$
$\left(s-1\right)\left(s^3+s^2+s+1\right)$
$3x^2=5+2x$
$\left(7.-1.-2.-1\right)$
$\left(x+2\right)\left(x+7\right)=36$
$\left(m+2\right)\left(m-6\right)$
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