$8x^7+3x^7$
$\lim_{x\to1}\left(\frac{x^8-1}{x-1}\right)$
$1-x^4$
$\left(\frac{\left(1-cosx\right)}{sinx}\right)-\left(\frac{sinx}{1-cosx}\right)$
$y=\frac{4x+2}{x^2-6x+9}$
$\frac{5x^{4}-3x^{3}+0x^{2}+0x-6}{10x+10}$
$42^3-1+52-1-22^2-1$
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