$\frac{4000}{-1000}$
$f\left(x\right)=\frac{2}{1+x^4}$
$-12x-48$
$a^4\cdot a^5$
$-\:21\:-\left(-21\right)$
$7 x ^ { 2 } + x 4 - y ^ { 2 } = 4$
$x2>=3$
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