$f'\left(1\right)\lim_{x\to1\:}\left(\frac{x^3-1}{x-1}\right)$
$\sqrt{169\times121}$
$\int\frac{w^3+1}{w\left(w-1\right)}dx$
$\:cos^2\left(a\right)\left(sec^2\left(a\right)-1\right)=1$
$7\left(x+1\right)-2x$
$2x^2-11x-40$
$64x^2-49y^2$
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