$-x^2+2x+3=x-3$
$83\cdot73$
$\frac{\sin\left(5x\right)+\sin\left(7x\right)}{\cos\left(5x\right)+\cos\left(7x\right)}=\tan\left(6x\right)$
$4-\left(-2\right)+1\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$\left(-4c+2\right)\left(4c+1\right)$
$\left(2a-3x+5b\right)^2$
$\lim_{x\to\infty}\left(\frac{\sqrt{\frac{2}{x^6}}}{\sqrt{\frac{2}{x^6}}}\right)$
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