$f\left(x\right)=\left(x^2+x-1\right)\left(x^2-x-1\right)$
$x^2-2x+7$
$4cos^2x-3=0$
$2x^2+3x-x^2-x$
$8\cdot2^{-3}+16^0$
$\left(yx-1\right)\left(xy+3\right)$
$\lim_{x\to0}\left(x^{x\cdot\ln\left(x\right)}\right)$
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