$\frac{104}{26}$
$-0.1-0.7$
$4n^2-20n+25=0$
$\frac{9}{\left(1-x\right)\left(1+2x\right)^2}$
$\lim_{x\to0}\left(\frac{\cos\left(x\right)\left(cos\left(h\right)-1\right)}{h}\right)$
$\left(\sin\left(x\right)+\sec\left(x\right)\right)\left(\sin\left(x\right)-\sec\left(x\right)\right)$
$x^2+8x+81$
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