$a2-4$
$5x^2-3x+4$
$\sqrt{a^6+b^6+2};\:a^4+b^4=47\:;\:\left(a\right)\left(b\right)=1$
$3-2\cdot3-2-1\cdot2$
$c\left(4x^2-1\right)$
$5m+4n-8m-3m^2n+2n+4m$
$\cos\left(x\right)\left(\sec\left(x\right)-\cos\left(x\right)\right)\sin\left(x\right)$
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