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$a\:\:+\:\:\:2\:b\:\:\:\:\:si\:\:\:\:\:a\:\:=\:\:3\:\:;\:\:b\:\:=\:\:4\:$
$\frac{e^{-x}}{4-e^{-2x}}$
$\int_0^{\frac{x}{2}}\left(\tan^2x\right)dx$
$\left(x+1\right)\left(x-2\right)+3x\left(x-2\right)$
$\frac{x}{b}-\frac{b}{a}^2$
$sin\:s\:=tan\:s\:cos\:s$
$2^32^42^6$
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