$t^4+4t^2+4$
$\left(3-8\right)\left(5-\left(2\right)\right)$
$\int\left(\frac{5x}{x^4+36}\right)dx$
$5+3-\left[-1-\left(-8-3+1\right)-7\right]+9$
$x^2-2x^2+1$
$x^2+2x>63$
$x-4<0$
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