$\left(2x-4\right)\left(2x+4\right)=2x^2$
$\frac{\left(1-cos\left(x\right)\right)\left(1+sec\left(x\right)\right)}{tan\left(x\right)}$
$n^2-27n+50$
$\left(7+19b\right)\left(-5\right)$
$\left(30\cdot0\right):\left(\left(-2\right)\cdot3\right)$
$cos^2\left(x\right)=-cos\left(2x\right)$
$2x^4+6x^3-2x-6$
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