$28a^4+8a^2$
$\left(3x-x^3+3\right)\cdot\:\left(x^2-3x+1\right)$
$cscx-2=0$
$20\cdot\frac{6.4766}{.004166}$
$\int\frac{1}{x\left(x^2-x+1\right)}dx$
$0,09b^4+0,25-0,3b^2$
$\frac{d}{dx}\left(y=\arctan x\right)$
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