$x^8-16x^4+64$
$34-\left(-9\right)$
$\frac{\left(8x^5-14x^4-9x^3+23x^2-18x\right)}{x+2}$
$f\left(x\right)=\frac{1}{\left(1+\sec x\right)^2}$
$f\left(x\right)=2^{x^2-1}$
$\left(mn+2\right)\left(2-mn\right)$
$3.2-3\left(\frac{2}{5}\right)$
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