$\left(n-4\right)x^2+2\left(n+3\right)x+3n-14=0$
$16\cdot22$
$4x^2-5x+6+2x^2-7x+4-8x^2+10x-10$
$\cos\left(u+v\right)\cos\left(v\right)+\sin\left(u+v\right)\sin\left(v\right)$
$4a^8+12a^4b^4+9b^8$
$\frac{x^n}{5^n}$
$\lim_{x\to2}\left(\frac{6e^x-x}{x}\right)$
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