$\frac{1}{a+a^2}+\frac{3}{a+a^2}$
$3x+1\le5x+7$
$2y'+2y=0$
$\lim_{x\to0}\left(\frac{3^{sinx}-1}{4x}\right)$
$a^2\cdot a^{-5}$
$2x^2+10x+2y^2-2y-7=0$
$0.6898435683363658\cdot1.0133\cdot10^5$
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